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.
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
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.
VX-1
PUSH PUSH
Stereo
Program
Equalizer
Operating Instructions
Input Connections The VX-1 accommodates nominal input levels of +4 dBu
(XLR connectors) balanced, or -10 dBV (RCA connectors)
unbalanced, selected by a rear-panel recessed switch.
The +4 dBu XLR input circuitry employs Meyer Sound’s
exclusive ISO™ Input, affording exceptional immunity from
ground loops and common-mode noise. The circuit makes
use of custom transformers employing a high-inductance
Source Output
Configuration
Balanced n/c - +
Unbalanced n/c GND +
Wiring of ISO™ Input
Pin 1 Pin 2 Pin 3
n/c + -
n/c + GND
Figure 1. ISO™ Input Polarity Table
VX-1 Output Polarity
Pin 1 Pin 2 Pin 3
GND - +
GND + -
GND - +
GND + -
nickel core and Faraday shield, achieving 500 volts of common-mode isolation. All three input connector pins float from
both circuit ground and chassis ground.
The ISO™ input circuit accommodates a wide variety of
input wiring configurations with no change in gain. Figure 1
illustrates output polarity for various balanced and unbalanced connections.
Output Connections Signal outputs from the VX-1 are active balanced, at nominal
+4 dBu operating level. The connectors may be wired bal-
AC Power Inlet and
Voltage Selector
The VX-1 is equipped with an international standard IEC 320
Mains AC inlet that accepts a variety of power cord types to
Connect -10 dBV unbalanced signal sources to the
rear-panel RCA connectors. These inputs bypass the
ISO™ transformer stage, and the connector shells are
tied to circuit ground.
Upon making input connections, check to be sure that
the input selector switch is set correctly.
anced or unbalanced, with maximum output levels
before clipping of +25 dBu or +19 dBu, respectively.
Meyer Sound, or an equivalent that satisfies the
requirements of the local safety testing agency.
accommodate mains outlets worldwide.
To change the AC voltage setting, first disconnect
The VX-1 must have the correct power cord, voltage setting
and fuse for the AC power source in your area. To avoid
electrical shock and damage, use only the cord specified by
AC Fuse To replace the fuse, insert a flat-blade screwdriver in
Primary protection for the VX-1 is provided by a
1
¦4 A SloBlo
fuse located in a receptacle adjacent to the AC inlet. Before
examining or replacing the fuse, first disconnect the AC
cord.
the AC cord. Using a small flat-blade screwdriver,
move the slide switches to the appropriate position as
indicated by the adjacent panel legend.
the fuse cap and gently turn counterclockwise. The
fuse will spring from its socket. Replace only with a
fuse of the type and rating specified by Meyer Sound.
Input
Select
XLR
RCA
+4 dBu
+4 dBu
Balanced
Input
-10 dBV
Input A
+4 dBu
-10 dBV
Unbalanced
Input
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
CAUTION:
AC Voltage Ranges
-10 dBV
Input B
Output A Output B
210 - 250
170 - 210
105 - 125
85 - 105
+4 dBu
Balanced
Output
Figure 2. VX-1 Rear Panel Connections (one channel shown)
Set voltage before applying power.
85-105
105-125
210-250
170-210
AC Voltage
1
A
/
4
Slo Blo
85-250V
50-60Hz
20W MAX
Mains
AC Power
Cord
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