Meyer Sound Home Theater System VX 1 User Manual

VX-1  
Stereo  
Program  
Equalizer  
Operating Instructions  
The Meyer Sound VX-1 is a two-channel program equal-  
izer featuring three bands of minimum-phase boost or  
cut equalization per channel. Optimized for composite  
response shaping of stereo program material, the VX-1  
utilizes a unique Virtual Crossover™ implementation,  
with two frequency breakpoint controls and separate  
gain controls for the Low, Mid and High bands.  
The VX-1 occupies a single 1.75" standard rack  
space, and the clearly marked controls include a  
Master gain control, a single EQ In/Out switch and  
a convenient Mono switch. Single-pole, minimum-  
phase circuitry assures natural, graceful sonic  
characteristics, even at extreme settings. The  
dynamic range of the VX-1 exceeds 100 dB.  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
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VX-1  
Stereo  
Program  
Equalizer  
Operating Instructions  
0
dB  
0
dB  
0
dB  
0
dB  
0
dB  
0
dB  
0 dB  
-3  
-6  
-3  
-6  
-3  
-6  
-3  
-6  
-3  
-6  
-3  
-6  
+2  
+6  
+3  
+3  
+3  
+3  
+3  
+3  
-3  
240  
4
k
240  
4
k
+3  
+4  
+5  
-6  
320  
6
k
320  
6
k
Power  
EQ  
Mono  
175  
110  
3
k
175  
110  
3
k
-12  
+6  
+6  
+6  
High  
+6  
+6  
+6  
High  
-12  
-12  
-12  
-12  
-12  
-12  
490  
9
k
490  
9
k
Low  
Mid  
Channel A  
2
k
Low  
Mid  
Channel B  
2
k
-24  
VX-1 Program Equalizer  
-
60  
1
k
1
k
17  
k
60  
1
k
1
k
17  
k
Gain  
Figure 3. VX-1 Front Panel Controls  
EQ In/Out Switch  
The EQ In/Out Switch engages (in) or bypasses (out) the  
VX-1 equalization stages. When the equalization is engaged,  
the LED lights and the equalization controls are active.  
When the equalization is bypassed, only the Master  
Gain control and Mono switch are active.  
Master Gain Control  
The Master Gain Control regulates the gain of the VX-1. Its  
range is from off to +6 dB, with 0 dB (unity) gain at the center  
position.  
Mono Switch  
When the Mono Switch is engaged (in), the LED lights and  
the two input channels are summed and routed to both out-  
puts with equal amplitude. When the Mono switch is  
disengaged (out), the VX-1 operates in stereo.  
Signal/Clip Indicators  
Equalization Controls  
Centered directly under the equalization controls for each  
channel, the Signal/Clip indicators will flicker green when  
their corresponding channels are passing audio. The  
indicators flash red to register signal clipping.  
The VX-1 features a unique, Virtual Crossover™ implemen-  
tation which is well suited for tailoring the broadband re-  
sponse of program material. Operationally, it may be likened  
to a conventional active loudspeaker crossover.  
Mid and High bands. The gain controls affect the  
relative amplitude (boost or cut) within each frequency  
band, with a range of -12 to +6 dB.  
The VX-1 equalization sections are first-order (6 dB/  
octave) minimum-phase networks that provide gentle,  
natural sonic characteristics. Figure 4 illustrates  
typical response curves for various midrange control  
settings.  
Each channel of equalization incorporates five controls: two  
frequency breakpoint controls, and three band gain controls.  
The left-hand frequency control regulates the frequency  
breakpoint between the Low and Mid bands, while the right-  
hand frequency control regulates the breakpoint between the  
+6.0  
+3.0  
0.0  
-3.0  
-6.0  
-9.0  
-12.0  
20  
100  
1k  
10k  
20k  
Frequency in Hz  
Figure 4. VX-1 Response at Various Midrange Settings  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
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VX-1  
Stereo  
Program  
Equalizer  
Operating Instructions  
Frequency Response1  
Specifications  
Equalization In (Controls set flat)  
Equalization Bypassed  
20 20,000 Hz +0, -0.5 dB  
20 20,000 Hz +0, -0.5 dB  
Total Harmonic Distortion2  
Hum and Noise3  
Dynamic Range4  
Inputs  
< .005%  
< 90 dBV AWeighted  
> 100 dB  
XLR  
Type  
Balanced, transformer-isolated ISOInput5  
16k ohms, 8k ohms per branch unbalanced6  
+4 dBu, 16 dB headroom  
Impedance  
Nominal Input Level  
Maximum Input Level7  
+20 dBu  
RCA  
Type  
Unbalanced active  
8k ohms  
Impedance  
Nominal Input Level  
Maximum Input Level  
-10 dBV  
0 dBV  
Outputs  
Type  
Balanced active push-pull, pin 1 to chassis = 500ý  
Impedance  
300 ohms, 150 ohms per branch unbalanced  
Nominal Output Level  
Maximum Output Level  
+4 dBu  
+25 dBu  
Controls & Indicators  
Front Panel  
Power  
Locking pushbutton, red LED  
Locking pushbutton, green LED  
Locking pushbutton, yellow LED  
31-position detented rotary controls  
Rotary control  
Notes:  
EQ In/Out  
Mono/Stereo  
Frequency, Gain  
Master  
1. Measured at 0 dB gain  
2. +18 dBV input, 1 kHz  
3. Unbalanced  
4. Aweighted noise floor  
to maximum RMS  
output  
Rear Panel  
5. ISOinput: Pins 1, 2  
and 3 are transformer-  
isolated. Shell is  
connected to chassis/  
AC mains ground. Pin  
3 positive for positive-  
going output at pin 3.  
6. Pure resistive through-  
out audio band  
7. Within operating band  
of each channel, this is  
the minimum worst-  
case level achieved  
before clipping.  
+4 dBu/-10 dBV select switch  
Connectors  
Recessed toggle  
Balanced Input, Output  
Unbalanced Input  
3-pin XLR male, female  
Gold-plated RCA female  
Power  
100/120/220/240 VAC, 50/60 Hz (switchable), 20W  
Physical  
Dimensions  
Weight  
19" W x 1.75" H x 7.5" D standard rack mount  
8 1/4 lbs (3.75 kg)  
8. 0 dBu ³ 0.775 vrms  
0 dBV = 1 vrms  
© 1991, Meyer Sound.  
05.045.010.01 A  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
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VX-1  
Stereo  
Program  
Equalizer  
Operating Instructions  
Examples of Program  
Equalization  
The examples on this page illustrate typical response  
characteristics obtained with various settings of the VX-1  
band gain and frequency controls.  
The control settings (Channel A only) used to obtain a  
specific response are shown in the detail below the curve  
plot.  
50 Hz  
20 kHz  
Frequency  
0
dB  
0
dB  
0
dB  
0 dB  
-3  
-6  
-3  
-6  
-3  
-6  
+2  
+6  
+3  
+3  
+3  
-3  
240  
4
k
+3  
+4  
+5  
-6  
320  
6
k
EQ  
175  
110  
3
k
-12  
+6  
+6  
+6  
High  
-12  
-12  
-12  
490  
9
k
Low  
Mid  
Channel A  
2
k
-24  
-
60  
1
k
1
k
17  
k
Gain  
Symmetrical High- and Low-Frequency Boost  
50 Hz  
20 kHz  
Frequency  
0
dB  
0
dB  
0
dB  
0 dB  
-3  
-6  
-3  
-6  
-3  
-6  
+2  
+6  
+3  
+3  
+3  
-3  
240  
4
k
+3  
-6  
320  
6
k
EQ  
+4  
+5  
175  
110  
3
k
-12  
+6  
+6  
+6  
High  
-12  
-12  
-12  
490  
9
k
Low  
Mid  
Channel A  
2
k
-24  
-
60  
1
k
1
k
17  
k
Gain  
Symmetrical High- and Low-Frequency Cut  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
Download from Www.Somanuals.com. All Manuals Search And Download.  
VX-1  
Stereo  
Program  
Equalizer  
Operating Instructions  
50 Hz  
20 kHz  
Frequency  
0
dB  
0
dB  
0
dB  
0 dB  
-3  
-6  
-3  
-6  
-3  
-6  
+2  
+6  
+3  
+3  
+3  
-3  
240  
4
k
+3  
+4  
+5  
-6  
320  
6
k
EQ  
175  
110  
3
k
-12  
+6  
+6  
+6  
High  
-12  
-12  
-12  
490  
9
k
Low  
Mid  
Channel A  
2
k
-24  
-
60  
1
k
1
k
17  
k
Gain  
Gradual Downward Tilt  
50 Hz  
20 kHz  
Frequency  
0
dB  
0
dB  
0
dB  
0 dB  
-3  
-6  
-3  
-6  
-3  
-6  
+2  
+6  
+3  
+3  
+3  
-3  
240  
4
k
+3  
-6  
320  
6
k
EQ  
+4  
+5  
175  
110  
3
k
-12  
+6  
+6  
+6  
High  
-12  
-12  
-12  
490  
9
k
Low  
Mid  
Channel A  
2
k
-24  
-
60  
1
k
1
k
17  
k
Gain  
Gradual Upward Tilt  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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