WOOFER 12WS600 - jbl selenium
WOOFER 12WS600 - jbl selenium
WOOFER 12WS600 - jbl selenium
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RESPONSE CURVES (0° AND 45°) IN A TEST ENCLOSURE INSIDE AN<br />
ANECHOIC CHAMBER, 1 W / 1 m<br />
110<br />
100<br />
POLAR RESPONSE CURVES<br />
60°<br />
30°<br />
50 Hz<br />
0<br />
-6<br />
-10<br />
330°<br />
300°<br />
<strong>WOOFER</strong><br />
<strong>12WS600</strong><br />
60°<br />
30°<br />
100 Hz<br />
0<br />
-6<br />
-10<br />
250 Hz<br />
-20<br />
-20<br />
-20<br />
90° dB<br />
270° 90° dB<br />
270° 90° dB<br />
270°<br />
330°<br />
300°<br />
60°<br />
30°<br />
0<br />
-6<br />
-10<br />
330°<br />
300°<br />
90<br />
120°<br />
240°<br />
120°<br />
240°<br />
120°<br />
240°<br />
dB<br />
80<br />
150°<br />
180°<br />
210°<br />
150°<br />
180°<br />
210°<br />
150°<br />
180°<br />
210°<br />
70<br />
30°<br />
500 Hz<br />
0<br />
-6<br />
330°<br />
30°<br />
800 Hz<br />
0<br />
-6<br />
330°<br />
30°<br />
1.25 kHz<br />
0<br />
-6<br />
330°<br />
60°<br />
-10<br />
300°<br />
60°<br />
-10<br />
300°<br />
60°<br />
-10<br />
300°<br />
60<br />
20 200<br />
Hz<br />
2k 20k<br />
Response Curve at 0°.<br />
Response Curve at 45°.<br />
-20<br />
90° dB<br />
270°<br />
120°<br />
150°<br />
180°<br />
210°<br />
240°<br />
-20<br />
90° dB<br />
270°<br />
120°<br />
150°<br />
180°<br />
210°<br />
240°<br />
-20<br />
90° dB<br />
270°<br />
120°<br />
150°<br />
180°<br />
210°<br />
240°<br />
IMPEDANCE AND PHASE CURVES MEASURED IN FREE-AIR<br />
400<br />
90<br />
30°<br />
2 kHz 3.15 kHz<br />
0<br />
-6<br />
330°<br />
30°<br />
0<br />
-6<br />
330°<br />
60°<br />
-10<br />
300°<br />
60°<br />
-10<br />
300°<br />
300<br />
45<br />
-20<br />
90° dB<br />
270°<br />
-20<br />
90° dB<br />
270°<br />
ohms<br />
200<br />
0<br />
degrees<br />
120°<br />
150°<br />
180°<br />
210°<br />
240°<br />
120°<br />
150°<br />
180°<br />
210°<br />
240°<br />
Polar Response Curve.<br />
100<br />
-45<br />
HARMONIC DISTORTION CURVES MEASURED AT 10% AES INPUT<br />
POWER, 1 m<br />
dB<br />
140<br />
120<br />
100<br />
0<br />
-90<br />
20 200 2k 20k<br />
Hz<br />
Impedance Curve.<br />
Phase Curve.<br />
80<br />
HOW TO CHOOSE THE RIGHT AMPLIFIER<br />
The power amplifier must be able to supply twice the RMS driver power. This<br />
3 dB headroom is necessary to handle the peaks that are common to<br />
musical programs. When the amplifier clips those peaks, high distortion<br />
arises and this may damage the transducer due to excessive heat. The use<br />
of compressors is a good practice to reduce music dynamics to safe levels.<br />
FINDING VOICE COIL TEMPERATURE<br />
It is very important to avoid maximum voice coil temperature. Since moving<br />
coil resistance (R E) varies with temperature according to a well known law,<br />
we can calculate the temperature inside the voice coil by measuring the<br />
voice coil DC resistance:<br />
T<br />
B<br />
T<br />
A<br />
R<br />
<br />
<br />
R<br />
B<br />
A<br />
<br />
1<br />
<br />
T<br />
<br />
1 <br />
25 <br />
<br />
25<br />
<br />
T A , T B= voice coil temperatures in °C.<br />
R A , R B= voice coil resistances at temperatures T A and T B, respectively.<br />
= voice coil wire temperature coefficient at 25 °C.<br />
POWER COMPRESSION<br />
Voice coil resistance rises with temperature, which leads to efficiency<br />
reduction. Therefore, if after doubling the applied electric power to the driver<br />
we get a 2 dB rise in SPL instead of the expected 3 dB, we can say that<br />
power compression equals 1 dB. An efficient cooling system to dissipate<br />
voice coil heat is very important to reduce power compression.<br />
A<br />
60<br />
20<br />
200 2k<br />
20k<br />
Hz<br />
Response Curve.<br />
Distortion Curve, 2nd harmonic.<br />
Distortion Curve, 3rd harmonic.<br />
NON-LINEAR VOICE COIL PARAMETERS<br />
Due to its close coupling with the magnetic assembly, the voice coil in<br />
electrodynamic loudspeakers is a very non-linear circuit. Using the nonlinear<br />
modeling parameters Krm, Kxm, Erm and Exm from an empirical<br />
model, we can calculate voice coil impedance with good accuracy.<br />
SUGGESTED PROJECTS<br />
VB1205B1 VB1205D1 HB1205A1 HB1205A3 HB1205D1<br />
For additional project suggestions, please access our website.<br />
TEST ENCLOSURE<br />
35-liter volume with a duct ø 3” by 1.97” length.<br />
Devido aos avanços tecnológicos, reservamo-nos<br />
o direito de inserir modificações sem prévio aviso.<br />
Cód.: 28026133 Rev.: 00 - 01 / 06<br />
www.<strong>selenium</strong>.com.br<br />
www.<strong>selenium</strong>loudspeakers.com