Thule Audio PA350B Multi Channel Amplifier Review - Hi-Fi Klubben
Thule Audio PA350B Multi Channel Amplifier Review - Hi-Fi Klubben
Thule Audio PA350B Multi Channel Amplifier Review - Hi-Fi Klubben
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<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:16 PM<br />
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<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
The Dr. Jekyll & Mr. Hyde of <strong>Amplifier</strong>s<br />
By: Gene DellaSala<br />
Date :August 30, 2006<br />
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
The Dr. Jekyll & Mr. Hyde of <strong>Amplifier</strong>s<br />
Page: 1 | 2 | 3 | 4 | Next<br />
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<strong>PA350B</strong> Home Theater <strong>Amplifier</strong> Summary<br />
Manufacturer: <strong>Thule</strong> <strong>Audio</strong><br />
Performance Rating: 4.25/5 (2CH Mode) 3.75 /5 (5CH Mode)<br />
Value Rating: 3.25/5<br />
<strong>Review</strong> Date: August 28, 2006<br />
MSRP: $3995<br />
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Pros<br />
Excellent measured and audio performance in<br />
2CH bridged mode<br />
Lightweight and compact design<br />
Runs relatively cool<br />
Specifications: <strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong><br />
Power output, 20-20k Hz, 8 ohm: 2x 350W / 5x 120W<br />
Power output, 20-20k Hz, 4 ohm: 2x 500W / 5x 160W<br />
Peak current capacity, 1ms, 0.6ohm: +/- 45A<br />
Frequency range: 20-20kHz +0/-0.5dB<br />
THD 20-20k Hz, -10dB, 8 ohms: 0.004%<br />
S/N 0dB: 112dBA<br />
Cons<br />
Very expensive<br />
Average 5CH power performance<br />
No +12V or Music trigger<br />
Doesn’t retain input selection on power cycle in<br />
2CH mode<br />
Introduction<br />
We have had the good fortune of testing some of the industry’s best multi-channel amplifiers. If you are from the camp that all<br />
amps sound the same, then don’t waste your time reading another amplifier review. The truth is, most amps sound similar if<br />
they: a) have wide enough bandwidth, b) low enough noise floor, c) are not driven beyond their linear operating region, and d) are<br />
capable of sourcing enough steady state power without clipping dynamics to satisfy your listening needs. The question remains<br />
however, “what is good enough”? <strong>Thule</strong> seems to think their design approach meets these criteria nicely and, best of all, does so<br />
in a reasonably-sized efficient package that likely won’t invoke a hernia to the installer. Their solution is a multi-channel amplifier<br />
that can be configured for 5- or 7-channels or be bridged for an ultra high power two-channel amp. With rack space being a<br />
premium these days, and heat being of paramount concern, this amplifier design certainly piqued my interest. I was eager to find<br />
out how this Danish-made amplifier would perform in the <strong>Audio</strong>holics’ Premier Showcase system.<br />
<strong>Audio</strong>holics Supports<br />
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Design Overview<br />
<strong>Thule</strong> refers to the <strong>PA350B</strong> as a “Virtual Class A” amplifier design. Upon inspecting their<br />
literature and also popping the top cover off, the best I could make of this claim is that the<br />
amp is a rail switcher which is biased into Class A (100mA of bias current is always flowing<br />
through the transistors according to the manufacturer) to eliminate cross over distortion<br />
caused by the on/off switching of a push pull transistor scheme found in most traditional<br />
Class B amps. This is nothing revolutionary as most modern linear amps these days are of<br />
a Class A/B design where the amp operates in Class A for low power levels. Although <strong>Thule</strong><br />
was able to achieve a higher bias into Class A while preventing excessive heat build up by<br />
rail switching at higher power levels.<br />
This amp employees a rail switching scheme where at low power levels it operates on +- 20V<br />
rails and switches over to +-40V rails for high output conditions. This is a typical design<br />
http://www.audioholics.com/productreviews/avhardware/<strong>Thule</strong><strong>Audio</strong><strong>PA350B</strong>p1.php<br />
Page 1 of 2
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:16 PM<br />
and Analog Devices<br />
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Industry Press Releases<br />
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Friday, September 8 2006<br />
LG Opens Electronics Plant<br />
in Russia<br />
Wednesday, September 6 2006<br />
dts <strong>Fi</strong>nalizes Branding of<br />
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Formats<br />
Wednesday, September 6 2006<br />
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Sunday, September 3 2006<br />
Klipsch Acquires Energy,<br />
Mirage, Athena Speaker<br />
Brands<br />
Friday, September 1 2006<br />
Logitech Intros Z-10<br />
Interactive 2.0 Speaker<br />
System<br />
Monday, August 28 2006<br />
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Premium & Limited Edition<br />
Systems<br />
Sunday, August 27 2006<br />
scheme of many modern Class G amps such as those from Outlaw <strong>Audio</strong>, Emotiva,<br />
Sherbourn, etc and if executed properly, can significantly increase efficiency and reduce<br />
heat dissipation without any audible audio penalties.<br />
<strong>Thule</strong> takes this design approach one welcomed step further by executing a TRUE fully<br />
balanced input to output topology from line level all the way to speaker level. They also<br />
caution the end user NOT to connect a ground reference to the speaker outputs. I paid<br />
careful attention to ensure that my <strong>Audio</strong> Precision <strong>Audio</strong> Analyzer was in balanced mode<br />
when testing this amplifier. There are a number of advantages to designing a fully balanced amplifier topology including, reducing<br />
distortion (cutting it in half) and noise (reducing it up to 6dB). The downside is increased circuit complexity and parts usage that<br />
most manufacturers opt not to undergo.<br />
Editorial Note on the <strong>PA350B</strong> <strong>Amplifier</strong> Design<br />
The <strong>PA350B</strong> is basically a Class G rail switching amp design.<br />
It contains two 500VA toroidal power supplies each with their own capacitor banks as<br />
indicated below.<br />
It has 2 x 15,000uF 50V caps for the +-40V HIGH rails and 2 x 15,000uF 25V caps for<br />
the LOW rails assigned to each power transformer. The manufacturer claims a<br />
whopping 120,000 uF of total power supply capacitance but since they operate each<br />
pair of capacitor banks on different rails, I consider the total effective supply<br />
capacitance to be ½ of this stated claim.<br />
The <strong>PA350B</strong> has a total of 36 output devices (2 pairs of which are reserved for<br />
upgrading this unit to 7 channels). I would presume that 2 output device pairs are<br />
allocated per channel while the amp gangs up 4 pairs per channel when bridged into<br />
2CH high power mode. Only 18 output devices are visible in the top view picture,<br />
though I suspect the other 18 are below the circuit board mounted to the heat sink.<br />
In order to do 350wpc a minimum recommended cap voltage of sqrt(2)*53 + 5 = 80V<br />
should be used. But because of the balanced amplifier topology, the required working<br />
voltage of the power supply and Caps is only ½ that. Thus 50V caps for the HIGH rail<br />
has sufficient design margin to achieve their sustained high power specification.<br />
The bridged output topology of this amplifier greatly increases efficiency and reduces<br />
heat dissipation compared to conventional amplifier designs.<br />
Care must be taken however when driving low impedance loads as most bridged<br />
amplifiers cannot safely drive loads below 2 ohms. <strong>Thule</strong> warns about this scenario<br />
as it will cause the amp to turn off if you present it with an impedance below 2 ohms.<br />
Editorial Note on Balanced vs Unbalanced Connections<br />
I measured the voltage gain of the <strong>Thule</strong> <strong>PA350B</strong> via balanced and unbalanced inputs and<br />
found the following:<br />
Unbalanced: Av = 29.8dB (about 0.8dB higher than THX standard)<br />
Balanced:<br />
Av = 23.8dB (6 dB lower than unbalanced)<br />
This is a standard practice in most consumer and pro audio. The preamp therefore usually<br />
has a +6dB boost via the balanced outputs to compensate. If you are using unbalanced to<br />
balanced connection scheme that I used in order to interface my receiver with this amp in<br />
bridged mode, you will likely find that you have to increase the channel trims of your main<br />
speakers to +6dB to compensate for the level offset.<br />
My personal criteria for amplifier gain structure is that it should be able to hit full power when<br />
driven with 2-3Vrms. The <strong>PA350B</strong> fell well within this criteria<br />
Check out our Balanced vs. Unbalanced Connections Article for more information.<br />
Page: 1 | 2 | 3 | 4 | Next<br />
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Page 2 of 2
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:18 PM<br />
Where audio and video equipment undergoes rigorous objective and subjective tests by our staff,<br />
ensuring that marketing slogans aren't the only guidelines for your home theater choices.<br />
September 8 2006<br />
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<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
The Dr. Jekyll & Mr. Hyde of <strong>Amplifier</strong>s<br />
By: Gene DellaSala<br />
Date :August 30, 2006<br />
Setup and Operation and Listening Tests<br />
Set-Up & Operation<br />
The <strong>Thule</strong> <strong>PA350B</strong> is a rather unique amplifier in the sense that it is the first I’ve run across<br />
with 3 power switches! That’s no typo, there is a Mains power switch located on the back of<br />
the chassis, a Fault switch located below the unit, and a Stand By front panel power switch. I<br />
can appreciate the manufacturer’s passion for safety, but I found the bottom chassis fault<br />
switch to be more of a nuisance than a benefit, especially after I loaded the unit in my Middle<br />
Atlantic Rack and found out the hard way it wouldn’t power up because I accidentally<br />
disengaged power to the fault switch when installing the 48lb amp at the top of my rack.<br />
Page: 1 | 2 | 3 | 4 | Next<br />
According to the manual, the <strong>PA350B</strong> requires an unusually long 2-4 hours to warm up and<br />
reach peek performance if cold started from the mains power switch, but only requires 10-15 minutes of warm up time if the unit<br />
is left in standby mode and then becomes active. While I can understand the benefits of allowing an amplifier to reach thermal<br />
equilibrium, I am uncertain as to why it would take as many hours as the manufacturer claims from a cold start. Nonetheless, I<br />
left the amp on for several hours before engaging in any critical listening tests or undergoing my power measurements.<br />
The <strong>PA350B</strong> can be triggered to toggle between 2CH and 5CH mode in three ways:<br />
Auto sense mode - if it detects signal on center channel it automatically switches to 5/7 CH mode<br />
Manually on front knob by pressing the 2CH/5CH button<br />
Their proprietary data port which interfaces with their matching preamplifier<br />
One operational quark that irked me regarding the bridged 2CH mode is that the unit automatically reverted back to balanced<br />
inputs each time it was power cycled. Since I wasn’t using their matching preamp to provide it data logic, I had to use some nifty<br />
Impact Acoustics unbalanced to balanced cables between the preamp of my Denon AVR-5805 receiver to this unit to always<br />
ensure I had audio signal present.<br />
The <strong>PA350B</strong> sports all high quality WBT style banana speaker terminals and gold plated RCA jacks with two balanced inputs for<br />
the high power 2CH bridged mode. It has no 12V trigger options (a disappointment to me) though the unit can be trigged via the<br />
proprietary data port connection if you are using their matching preamp. The S1 & S2 connections are intended for upgrading this<br />
unit to 7 channels of amplification.<br />
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Subjective Listening Tests<br />
I spent most of my time listening to the <strong>PA350B</strong> is 2CH bridged mode connected to the top portion of my new RBH Sound T30-<br />
LSE system. This is a special anniversary edition of the T2P System fitted with Status Acoustics driver upgrades and enhanced<br />
high excursion dual 10” subwoofers. There are also other upgrades in the crossovers and increased box volume for the bass<br />
drivers. <strong>Audio</strong> nirvana has been reached, but pairing these babies with quality amplification is a must. I used the <strong>Thule</strong> <strong>PA350B</strong><br />
and some new, soon to be released, 1U high subwoofer amplifiers from Earthquake to power the bass modules.<br />
When switching between 5CH mode and 2CH bridged mode, the latter seemed much more dynamic, and lively. The 5CH mode<br />
of this amp simply didn’t have enough oomph to drive my 4 ohm speakers to reference levels in my nearly 6,000 ft^3 Auralextreated<br />
<strong>Audio</strong>holics Showcase Room. While the <strong>PA350B</strong> didn’t sound bad in 5CH mode, it simply didn’t have the heavyweight<br />
feeling it took on once it was switched over to 2CH bridged mode. If there were ever a case of Dr. Jekyll & Mr. Hyde in<br />
amplifiers, this was it! In 5CH mode the <strong>PA350B</strong> was a mild mannered amplifier much like those found in very good mid-priced<br />
receivers. A quick switch over to 2CH bridged mode revealed the true dynamic nature of the beast while at the same time<br />
http://www.audioholics.com/productreviews/avhardware/<strong>Thule</strong><strong>Audio</strong><strong>PA350B</strong>p2.php<br />
Page 1 of 3
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:18 PM<br />
and Analog Devices<br />
Wednesday, September 6 2006<br />
Toshiba Announces first<br />
HDMI 1.3-enabled HD DVD<br />
Player for European<br />
Market<br />
Wednesday, September 6 2006<br />
<strong>Audio</strong>holics CEDIA 2006<br />
Coverage: What the Heck<br />
Are We Doing?<br />
Wednesday, September 6 2006<br />
The OPRA Awards! Sign up<br />
now!<br />
Friday, August 25 2006<br />
proving muscle could be matched with finesse with its dead silent noise floor and very open and natural sound. The <strong>PA350B</strong><br />
loved to be cranked and had all of the dynamics and clarity needed to power my new reference speakers to SPL levels beyond<br />
that of what most mere mortals (including myself) could bear to listen too.<br />
I didn’t want to baby this amp, so I threw the most dynamic material in my collection at it from the likes of Patricia Barber, Diana<br />
Krall, Jaco Pastorius and Pat Metheny. The Pat Metheny & John Scofield - I Can See Your House From Here to this day<br />
remains one of my favorite CDs to listen to for critical 2CH audio evaluations. This disc quickly reveals the dynamic nature of a<br />
hifi system from amplifier stage all the way to the speakers. Wimpy amps will clip or sound stringent during drum solos and<br />
cymbal crashes. This was not the case with the <strong>Thule</strong> <strong>PA350B</strong> amplifier when bridged in 2CH mode. It was able to convey all of<br />
the dynamic nature of Track #4 “Everybody’s Party” with ease. The cymbal crashes were liquid and transparent while the brush<br />
strokes retained their airy sonic signature I was familiar with when evaluating this CD on other excellent components that have<br />
graced my reference system in the past.<br />
<strong>Audio</strong>holics On-Spot<br />
Location: APC AV<br />
Tuesday, August 22 2006<br />
RF Remote Controls: Is It<br />
Time for You to Step Up?<br />
Monday, August 21 2006<br />
<strong>Audio</strong>holics On<br />
(permanent?) Location:<br />
LAX<br />
Thursday, August 10 2006<br />
Industry Press Releases<br />
Auralex Acoustics<br />
Introduces SonoSuede<br />
System at CEDIA 2006<br />
Friday, September 8 2006<br />
LG Opens Electronics Plant<br />
in Russia<br />
Wednesday, September 6 2006<br />
dts <strong>Fi</strong>nalizes Branding of<br />
<strong>Hi</strong>gh Definition DVD <strong>Audio</strong><br />
Formats<br />
Wednesday, September 6 2006<br />
Universal Remote Control<br />
Launches New Web Site<br />
Sunday, September 3 2006<br />
Klipsch Acquires Energy,<br />
Mirage, Athena Speaker<br />
Brands<br />
Friday, September 1 2006<br />
Logitech Intros Z-10<br />
Interactive 2.0 Speaker<br />
System<br />
Monday, August 28 2006<br />
VidaBox Debuts New<br />
Premium & Limited Edition<br />
Systems<br />
Sunday, August 27 2006<br />
I have recently become acquainted with the late and great Jaco Pastorius who is quickly becoming one of my favorite bass<br />
players – yes I am a sucker for fretless bass. My neighbor brought over a multichannel SACD from him, not knowing what he<br />
had in his possession; we popped it in for a listen. It became readily apparent we had reference multi-channel material on our<br />
hands. This is perhaps one of the best sounding multi-channel recordings I’ve heard to date. The <strong>Thule</strong> <strong>PA350B</strong> seemed to love<br />
this SACD as well as it belted out plenty of clean and dynamic sound throughout the entire listening session.<br />
kinda JAZZY kinda FUNKY from <strong>Hi</strong>ghNote Records is a groovy compilation of jazz that you just don’t get on the radio, and rarely<br />
have the opportunity to hear live (at least in my neck of the woods). The jazz organ was reproduced with amazing clarity and<br />
fluidity on track #7 “Peach Cobbler” by Bill Heid. The trumpet solos were so vibrant and real, I felt like I was at the Old Jazz<br />
Cellar I used to visit in Ybor City back in my college days. All I was missing in this listening session was a pint of my favorite<br />
brew.<br />
For fun, I decided to run my RBH T30-LSE system entirely off the <strong>Thule</strong> <strong>PA350B</strong> in 2CH bridged mode, thus bypassing the<br />
Earthquake amps that were powering the subwoofer portions of my speakers. I couldn’t think of a better torture test than using<br />
the Dianne Reeves Never too Far CD I had on hand.<br />
Dianne Reeves’ Track#1 “Hello (Haven’t Seen You Before)” bass line is quick and sustained. It tests transient response of<br />
speaker system. With the <strong>Thule</strong> <strong>PA350B</strong> running my main speakers full range, the bass was incredibly tight and well<br />
pronounced, despite the fact I shut off my additional 2 subwoofers which were strategically placed in the room to provide more<br />
uniform bass in the listening area. I was a little unsure at first if the <strong>PA350B</strong> would be up for running my speakers full range<br />
since the internal subwoofers in the system don’t have a crossover network. They were designed to roll off based on the natural<br />
acoustical slopes of the drivers. As a result, they have stellar transient response but also represent a difficult load to wimpy<br />
amps since they are highly inductive. The <strong>PA350B</strong> had no qualms about accepting this challenge and effortlessly drove my<br />
speakers with ample and well-controlled bass and nuclear highs. It revealed its “Hyde” character when called upon to do so.<br />
In track #2, “Never too Far”, the chorus sounded like it emanated from the side channels. If I hadn’t confirmed my processor was<br />
set to 2CH, I’d think I was listening in PLIIx Music Mode. The stereo separation was excellent and I was rewarded with a<br />
naturally LARGE soundstage just like I would expect from any well engineering amplifier.<br />
Track #3 “Come In’ literally shook the floor of my 6,000ft^3 reference room. Plenty of power taxing bass was present while at the<br />
same time excellent vocal clarity and non sibilant highs were consistently reproduced.<br />
Switching this amp to 5CH mode simply revealed the Dr. Jekyll side of this amplifier. The amp simply couldn’t keep up with the<br />
demand of my speakers. The bass was no longer as punchy and the transients weren’t nearly as dynamic. I also noticed the<br />
noise floor was audibly higher and the amp simply didn’t sound as refined or effortless. For small satellite speaker systems this<br />
will likely be of no consequence, but for those budding audiophiles who require raw power for their monster-sized speaker<br />
systems, 2CH bridged mode with this product is your only logical recourse.<br />
Recommendations<br />
The <strong>Thule</strong> <strong>PA350B</strong> multi-channel amplifier left me with mixed recommendations. As a 2CH bridged amplifier, it is a very fine<br />
amplifier. Its performance and sound quality is excellent, and its cool running compact chassis is appealing for those with limited<br />
rack space and the lack of desire to lug a 100lb amp up a flight of steps to get to their theater room.<br />
However, as a 5CH amp, it falls short of its published power specifications though still performing above average. It didn’t have<br />
quite enough juice to power my reference system in the large sized room I was using it in, but may be sufficient for smaller scale<br />
installations where the user is running a bass managed satellite speaker system with multiple subs.<br />
<strong>Thule</strong> employed a fully complimentary circuit topology from input all the way to the speaker outputs. This is very rare in the audio<br />
industry as it greatly increases component costs and circuit complexity. However, it pays dividends in achieving exemplary low<br />
distortion figures. As you can see in my test results, the <strong>Thule</strong> amp produced some of the lowest distortion figures we’ve seen to<br />
date regardless of price or proclaimed power. My hats off to them for designing a truly fully balanced amplifier – the only way to<br />
do it in telecom industry in order to accurately pass distortion free data over long distances. Their efforts in this capacity<br />
certainly paid off in the amplifier’s sonic signature which to me seemed very laid back, natural and unstressed in 2CH bridged<br />
mode.<br />
Considering its asking price of $4k, it’s not the bargain basement of amplifier brands you may be accustomed to when dealing<br />
with many of the online manufacturers. As is the case with most European products, while you may have to pay through the<br />
nose to get these products you are sure to find a compact design that can competently serve your 2CH and multi-channel needs.<br />
If this describes you, then you should take this baby out for a test drive.<br />
http://www.audioholics.com/productreviews/avhardware/<strong>Thule</strong><strong>Audio</strong><strong>PA350B</strong>p2.php<br />
Page 2 of 3
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:18 PM<br />
See Measurement, Analysis & Scorecard<br />
Page: 1 | 2 | 3 | 4 | Next<br />
Power, PWM <strong>Amplifier</strong>s<br />
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Used power amplifiers<br />
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Page 3 of 3
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:25 PM<br />
Where audio and video equipment undergoes rigorous objective and subjective tests by our staff,<br />
ensuring that marketing slogans aren't the only guidelines for your home theater choices.<br />
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<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
The Dr. Jekyll & Mr. Hyde of <strong>Amplifier</strong>s<br />
By: Gene DellaSala<br />
Date :August 30, 2006<br />
Measurements & Analysis<br />
Page: 1 | 2 | 3 | 4 | Next<br />
<strong>Amplifier</strong> Efficiency<br />
<strong>Amplifier</strong> Efficiency Measurements ranged from as low as 38% in 5CH mode when driving just one channel at full unclipped<br />
power, all the way up to 54% when driving 2 channels at full, undistorted power into 4 ohms. In 2CH mode I achieved nearly 51%<br />
efficiency when driving a single channel at full power into a 4 ohm load. These are pretty decent efficiency #’s and certainly a bit<br />
higher than most conventional linear A/B amplifier designs. As you can see in the tabulated data below, the closer to drive an<br />
amplifiers power supply to full load condition, the more efficient the power delivery becomes.<br />
Power Bandwidth<br />
Mode<br />
# Ch<br />
Driven<br />
Power<br />
Consumption<br />
Power<br />
Delivered<br />
Load<br />
Efficiency<br />
5CH 1 225 watts 86 watts 8 ohms 38 %<br />
5CH 2 360 watts 172 watts 8 ohms 47 %<br />
5CH 2 612 watts 330 watts 4 ohms 54 %<br />
2CH 1 1116 watts 566 watts 4 ohms 51 %<br />
Editorial Note On <strong>Amplifier</strong> Efficiency Data<br />
I suspect the slightly lower efficiency of the 566 watt power delivery scenario was a result of<br />
excessive heat losses in the power supply and amp section. This test was overexceeding<br />
the power consumption specification from the manufacturer by over 116 watts and was likely<br />
a bit too much for the heat sinks to dissipate and the power transformers to handle under<br />
continuous loading.<br />
5CH Mode Power vs Frequency Response<br />
<strong>Audio</strong>holics Supports<br />
The -3dB point of this amp is around 60kHz when driven to full unclipped continuous power 85wpc (0.1% THD + N) into 2<br />
channels driven or 165wpc into 4 ohms with 2 channels driven. 85wpc was a bit shy (-1.5dB) of their 120wpc claim into 8 ohms<br />
but they did deliver rated power into 4 ohm loads. I was unable to sweep down to 10Hz at full power because amp kept switching<br />
into protection mode in 5CH Mode.<br />
This did not occur in 2CH Bridged Mode however.<br />
http://www.audioholics.com/productreviews/avhardware/<strong>Thule</strong><strong>Audio</strong><strong>PA350B</strong>p3.php<br />
Page 1 of 4
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:25 PM<br />
<strong>Audio</strong>holics Editorials<br />
Wireless HDMI from Tzero<br />
and Analog Devices<br />
Wednesday, September 6 2006<br />
Toshiba Announces first<br />
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Wednesday, September 6 2006<br />
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Monday, August 21 2006<br />
<strong>Audio</strong>holics On<br />
(permanent?) Location:<br />
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Thursday, August 10 2006<br />
Industry Press Releases<br />
Auralex Acoustics<br />
Introduces SonoSuede<br />
System at CEDIA 2006<br />
Friday, September 8 2006<br />
LG Opens Electronics Plant<br />
in Russia<br />
Wednesday, September 6 2006<br />
2CH Bridged Mode Power vs Frequency Response<br />
In 2CH bridged mode, the <strong>PA350B</strong> was able to achieve a whopping 317wpc with two channels driven continuously above 50Hz (-<br />
3dB point around 53kHz) with less than 0.1% THD + N into 8 ohms. However, when driving 2 channels simultaneously, I was<br />
unable to exceed 265wpc x 2 without having the amp shut off if driving any greater power levels at low frequencies (below 50Hz)<br />
for sustained continuous conditions. This isn’t surprising since in order to deliver 317wpc x 2 continuously, the power supply<br />
would have to be capable of delivering (317 x 2 / .5) = 1268 watts which the two 500VA transformers in this amplifier aren’t<br />
capable of delivering. The amp would require at least 750VA dual transformers to accomplish such a feat. This would likely<br />
never be an issue in real world since we don’t listen to continuous correlated test tones.<br />
I was able to achieve unclipped 500wpc continuously at (0.1% THD + N) into 1 channel driven at 4 ohms. Unfortunately, the<br />
amplifier didn’t have a large enough power supply to deliver its full power rating continuously into 2 channels. If I drove it any<br />
higher than 200wpc x 2 continuously at full bandwidth into 4 ohms, the amplifier would shut off. This is an unlikely real world<br />
scenario but something to be mindful of if you have an appetite for achieving LOUD SPL levels from 4 ohm, moderately sensitive<br />
(
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:25 PM<br />
2CH Bridged Unbalanced 285 watts 100 dB<br />
2CH Bridged Balanced 1 watt 80 dB<br />
2CH Bridged Balanced 285 watts 104 dB<br />
In 5CH mode, the <strong>PA350B</strong> exhibited about average SNR performance from what we’ve come to expect of high performance<br />
amplifiers. 2CH bridged mode however exhibited a significant improvement in amplifier noise floor which is most apparent by the<br />
6dB improvement at 1 watt. Using the balanced inputs further lowered the noise floor another 4dB or so to achieve a very<br />
respectable 80dB SNR @ 1 watt unweighted. The manufacturers SNR specification of 112 dBA seems about right for a full<br />
power measurement using A-weighted filtering.<br />
<strong>Amplifier</strong> Output Impedance<br />
The amplifier output impedance was superb in both 5CH Mode and 2CH Bridged Mode. It maintained well under 100 mohms (our<br />
benchmark #) for the entire audio frequency range. This amplifier should sound very consistent between different speaker types<br />
assuming it isn’t driven beyond its power limits.<br />
The amplifier output impedance was again under 100mohns in 5CH mode and about half that in bridged mode. The increased<br />
output impedance below 20Hz indicated perhaps where they chose the pole for high pass filtering the low end response to block<br />
DC. Incidentally this is the frequency area that caused the amp to shut off if swept at full power – again a non likely real world<br />
scenario. The accentuated output impedance at 40kHz into a 4 ohm load in Bridged mode was a bit peculiar but since it was well<br />
out of the audio range, I didn’t give it much thought for further investigation.<br />
http://www.audioholics.com/productreviews/avhardware/<strong>Thule</strong><strong>Audio</strong><strong>PA350B</strong>p3.php<br />
Page 3 of 4
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:25 PM<br />
The damping factor of the <strong>Thule</strong> amp in 2CH bridged mode was uniformly excellent at all power levels and load impedances as<br />
was expected based on the measured output impedance. I was a bit puzzled as to why the amps output impedance had such a<br />
sharp rise at 20Hz, causing poor damping, when driven to full power. I could only assume it was some intentional protective<br />
measure to NOT overdrive the amplifier. This did not cause any audible hiccups in my listening tests however.<br />
Even in 5CH mode, the <strong>Thule</strong> amp exhibited excellent damping characteristics, though the puzzling 20Hz loss of damping at high<br />
power was also prevalent.<br />
Page: 1 | 2 | 3 | 4 | Next<br />
Load Cell Solutions<br />
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Page 4 of 4
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:33 PM<br />
Where audio and video equipment undergoes rigorous objective and subjective tests by our staff,<br />
ensuring that marketing slogans aren't the only guidelines for your home theater choices.<br />
September 8 2006<br />
Become an AH Member!<br />
Dell Speakers<br />
Med Dell får du høj kvalitet, stor ydelse og<br />
den nyeste teknologi!<br />
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Vi har hvad du søger! Prøv vores GN 9350<br />
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Power, PWM <strong>Amplifier</strong>s<br />
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<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
The Dr. Jekyll & Mr. Hyde of <strong>Amplifier</strong>s<br />
By: Gene DellaSala<br />
Date :August 30, 2006<br />
Conclusion<br />
Page: 1 | 2 | 3 | 4 |<br />
Subjective Score card<br />
The scoring below is based on each speaker doing the duty it is designed for. The numbers are weighed heavily with respect to<br />
the individual cost of each unit, thus giving a rating equal to:<br />
Performance x Price Factor/Value = Rating<br />
<strong>Audio</strong>holics.com note: The ratings indicated below are based on subjective listening and objective testing of the product in<br />
question. The rating scale is based on performance/value ratio. If you notice better performing speakers in future reviews that<br />
have lower numbers in certain areas, be aware that the value factor is most likely the culprit. Other <strong>Audio</strong>holics reviewers may<br />
rate speakers solely based on performance, and each reviewer has their own system for ratings.<br />
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<strong>Audio</strong>holics Ratings Scale<br />
- Outstanding (reserved for features or areas that exceed market norms)<br />
- Above Average<br />
- Average<br />
- Below Average<br />
- Very Poor<br />
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong>-channel <strong>Amplifier</strong> Score Card<br />
Metric<br />
Rating<br />
2CH<br />
Frequency Response Linearity (20-20k +/- 0.25dB)<br />
Damping Factor (>50 all power levels)<br />
Output Impedance (90dB @ 1 watt, unweighted)<br />
Measured Power Into 8-ohms<br />
5CH<br />
<strong>Audio</strong>holics Supports<br />
<strong>Audio</strong>holics Editorials<br />
Wireless HDMI from Tzero<br />
Measured Power Into 4-ohms (ideally 2x 8-ohms)<br />
Subjective Evaluation<br />
5 <strong>Channel</strong> Mode<br />
2 CH Mode<br />
Practical Considerations<br />
Construction Material Quality<br />
Overall <strong>Fi</strong>nish Quality/WAF<br />
Ergonomics<br />
Ease of Setup<br />
Features<br />
Performance Metrics<br />
Rating<br />
Rating<br />
http://www.audioholics.com/productreviews/avhardware/<strong>Thule</strong><strong>Audio</strong><strong>PA350B</strong>p4.php<br />
Page 1 of 2
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> <strong>Multi</strong> <strong>Channel</strong> <strong>Amplifier</strong> <strong>Review</strong><br />
09/08/2006 10:33 PM<br />
Wireless HDMI from Tzero<br />
and Analog Devices<br />
Wednesday, September 6 2006<br />
Toshiba Announces first<br />
HDMI 1.3-enabled HD DVD<br />
Player for European<br />
Market<br />
Wednesday, September 6 2006<br />
<strong>Audio</strong>holics CEDIA 2006<br />
Coverage: What the Heck<br />
Are We Doing?<br />
Wednesday, September 6 2006<br />
The OPRA Awards! Sign up<br />
now!<br />
Friday, August 25 2006<br />
<strong>Audio</strong>holics On-Spot<br />
Location: APC AV<br />
Tuesday, August 22 2006<br />
Subjective Evaluation<br />
Value<br />
<strong>Thule</strong> <strong>Audio</strong> <strong>PA350B</strong> 7CH <strong>Amplifier</strong> MSRP $3995<br />
<strong>Thule</strong> <strong>Audio</strong> Electronics<br />
http://www.thule-audio.dk/<br />
US Importer / Distributor for <strong>Thule</strong> <strong>Audio</strong><br />
John Craig<br />
Craig Acoustics, Inc.<br />
www.craigacoustics.com<br />
714-648-0983<br />
fax: 714-835-5937<br />
Page: 1 | 2 | 3 | 4 |<br />
RF Remote Controls: Is It<br />
Time for You to Step Up?<br />
Monday, August 21 2006<br />
<strong>Audio</strong>holics On<br />
(permanent?) Location:<br />
LAX<br />
Thursday, August 10 2006<br />
Industry Press Releases<br />
Auralex Acoustics<br />
Introduces SonoSuede<br />
System at CEDIA 2006<br />
Friday, September 8 2006<br />
LG Opens Electronics Plant<br />
in Russia<br />
Wednesday, September 6 2006<br />
dts <strong>Fi</strong>nalizes Branding of<br />
<strong>Hi</strong>gh Definition DVD <strong>Audio</strong><br />
Formats<br />
Wednesday, September 6 2006<br />
Universal Remote Control<br />
Launches New Web Site<br />
Sunday, September 3 2006<br />
Klipsch Acquires Energy,<br />
Mirage, Athena Speaker<br />
Brands<br />
Friday, September 1 2006<br />
Logitech Intros Z-10<br />
Interactive 2.0 Speaker<br />
System<br />
Monday, August 28 2006<br />
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Premium & Limited Edition<br />
Systems<br />
Sunday, August 27 2006<br />
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Page 2 of 2