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NERDY IMPEDANCE INFORMATION AHEADThe following is some information that you’ll find useful for hooking up yourValvetronix AD60VTH or AD120VTH head. When you’re done with this,you’ll be a smarter and better person! Plus you’ll know the correct way forhooking up speaker cabinets in series or parallel.In multiple speaker cabinet configurations, you will have to use a little mathematics(Ohm’s law) in order to figure out the correct setting. Don’t worry though; it’s easierthan you might think! The formula will depend on whether you are hooking thecabinet(s) up in series or parallel. Parallel is more common which is how theAD60VTH and AD120VTH work.ParallelWhen using two cabinets of the same impedance in parallel, just divide the impedanceof one cabinet by 2. For example, when using two 8 Ohm cabinets in parallel,set the impedance selector on the amp for 4 Ohms (8 divided by 2 equals 4). Whenusing two cabinets and each is 16 Ohms set the amp for 8 Ohms. Here is theOhm’s Law formula for connecting two speakers (or cabinets) in parallel:Let’s take two 16 Ohm cabinets for this example:R3 = 16 x 16 = 256 =8 Ohms16 + 16 32SeriesIn a series configuration, all you do is add the individual impedances of the cabinets.For example, if you hook up two cabinets, where each is 8 Ohms (8 plus 8),the result is 16 Ohms. If one cab is 8 Ohms and the other is 4 Ohms, the totalimpedance is 12 Ohms. There are no 12 Ohm settings on amps, so set your ampto 16 Ohms.R1 is the impedance of our first cabinet; R2 is the impedance of the second oneand R3 is the resulting impedance when they are hooked-up together.R3 = R1 x R2R1 + R2Using two cabinets of different impedance is a bit more complicated. Check it out…Let’s take one 16 Ohm cabinet and one 8 Ohm cabinet for this example:R3 = 16 x 8 = 128 =5.33 Ohms16 + 8 248If the minimum impedance of your amp is 8 Ohms do not use it with a 16 and 8Ohm cabinet in parallel. If the minimum impedance or your amp is 4 Ohms, you areOK to go.
SpecificationsNumber of amp types: 16Number of effects:Drive types: 10Modulation types: 5Delay types: 3Reverb types: 3Noise reduction: 1Number of programs: 32 (8 bank x 4 channel)Number of inputs:AD60VTHTop panel: 2 (High & Low)Rear panel: 1 x Loop return1 x Foot controller jackAD120VTHTop panel: 2 (High & Low)Rear panel: 2 x Loop return1 x Foot controller jackNumber of outputs:AD60VTHRear panel: 1 x Loop send1 x Phone out1 x Line out2 x Speaker out (Parallel connection)AD120VTHRear panel: 2 x Loop send1 x Phone out2 x Line out4 x Speaker outL ch: 2 x Speaker out (Parallel connection)R ch: 2 x Speaker out (Parallel connection)Power outputAD60VTH: 60 Watts RMS @8 ohmAD120VTH: 60 Watts RMS x 2 (L/R) @8 ohmTuning range: A0–C7 (27.5 Hz–2093 Hz)Tuner calibration: A = 438–445 Hz9
Page 1: Addendum
Page 5: InputInputTwo 8 Ohm cabinets5
Page 10: Signal processingA/D Conversion: 20

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