Valcom Stereo Equalizer V 9975 User Manual

VSP-V-9975  
Issue 4  
V-9975  
SEVEN BAND EQUALIZER  
INTRODUCTION  
These instructions contain the specifications and  
information necessary to install, operate, and  
maintain the V-9975, Seven Band Equalizer.  
SPECIFICATIONS  
Features  
7 active filters  
Modified 1 octave equalization  
+ 12 dB boost or cut  
Constant Q equalization  
Power "ON" indicator  
Bypass switch to remove EQ from circuit  
(slide type)  
Environment  
High impedance output  
Line output  
Temperature:  
Humidity:  
0 to 50 Degrees C  
0-85% non-precipitating  
Nominal Specifications  
OPERATION  
Type of Inputs:  
Hi impedance 10K Ohms (unbalanced)  
Stereo HiZ 10K Ohms (unbalanced)  
The V-9975 is used to boost or attenuate specific  
frequencies to improve voice intelligibility or  
attenuate frequencies to help reduce feedback. The  
unit can also be used to modify the frequency  
response of speakers.  
Type of Outputs:  
Line (balanced)  
Hi impedance 10K Ohms (unbalanced)  
Frequency Response:  
Distortion:  
Frequency Centers:  
35Hz-20kHz +1dB  
< 0.3%  
A "POWER" indicating LED, 7 slide controls (1 for  
each of the bands), and an "EQ" bypass switch are  
located on the front of the unit. The frequencies  
boost/cut (1 to 12 dB), are modified with each filter's  
slide control. The manual "EQ" bypass switch allows  
comparison of before equalization, and after effect, in  
the area being equalized. All frequency adjustments  
are bypassed when the "EQ IN/OUT" switch is in the  
"OUT" position.  
Band 1 = 60 Hz  
2 = 200 Hz  
3 = 560 Hz  
4 = 1100 Hz  
5 = 2200 Hz  
6 = 4500 Hz  
7 =10000Hz  
Power Requirements  
-24VDC  
150 mA  
INSTALLATION  
Connections are accomplished utilizing (3) phono  
jacks (2 input, 1 output) and/or (9) screw terminals.  
Only qualified service personnel should install the  
V-9975. See Figures 1 and 2 for actual connections.  
After all connections are made and slide controls  
adjusted to the desired positions, close security cover  
and tighten locking screws. All connections should  
be made and double checked before DC power is  
supplied to the unit.  
Dimensions/Weight  
5.7" H x 8.1" W x 2.5" D  
(14.5cm W x 20.6cm H x 6.4cm D)  
2.8 lbs. (1.27 kg)  
1
947006  
 
FIGURE 1 - CONNECTIONS  
60 H z  
200 H z  
560 H z  
1100 H z  
2200 H z  
4500 H z  
10 kH z  
+12 dB  
+6 dB  
0 dB  
POW ER  
-6 dB  
-12 dB  
60 H z  
200 H z  
560 H z  
LIN E OU T  
AU D IO OU TPU T  
AU D IO IN PU T GN D GN D GN D  
1100 H z  
2200 H z  
4500 H z  
10 kH z  
EQ  
IN OUT  
GN D  
-24VD C  
N OT FOR U SE W ITH  
TALKBAC K SPEAKER S  
AU D IO  
IN L.  
AU D IO  
IN R .  
AU D IO  
OU T  
-24VD C  
POW ER  
SU PPLY  
GN D  
LEFT  
R IGH T  
TO BAC KGR OU N D  
MU SIC IN PU T  
OU TPU T  
M USIC SOURCE  
FIGURE 2 - CONNECTIONS  
60 H z  
200 H z  
560 H z  
1100 H z  
2200 H z  
4500 H z  
10 kH z  
+12 dB  
+6 dB  
0 dB  
POW ER  
-6 dB  
-12 dB  
60 H z  
200 H z  
560 H z  
LIN E OU T  
AU D IO OU TPU T  
AU D IO IN PU T GN D GN D GN D  
1100 H z  
2200 H z  
4500 H z  
10 kH z  
EQ  
IN OUT  
GN D  
-24VD C  
N OT FOR U SE W ITH  
TALKBAC K SPEAKER S  
AU D IO  
IN L.  
AU D IO  
IN R .  
AU D IO  
OU T  
-24VD C  
R
T
POW ER  
SU PPLY  
PAGE  
C ON TR OL  
GN D  
T
R
3
947006  
 

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