Operating Instructions
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
CP-10S
Complementary
Phase
Parametric
Equalizer
Connections
Rear panel connectors are XLR-type and both inputs and
outputs are balanced. An associated rear-panel switch
labeled
Balanced/Unbalanced Gain Adjust
controls the
unit’s gain to accommodate either unbalanced or balanced
output connections.
In the
Unbalanced
position, the channel gain is unity when
CP-10S is driving a single-ended device input. In the
Balanced
position, the channel gain is unity for a balanced
output connection. When the two channels of the CP-10S
are to be connected in series using a normal two-conductor
shielded microphone cable, the switch should be set to the
Balanced
position.
AC Power Inlet and
Voltage Selector Switch
The rear-panel AC input connector is an IEC/CEE Stan-
dard Receptacle. The signal path relay closes only when
power supplies are stable, and once the relay is closed the
unit is inserted into the signal path. In the event of loss of
AC power or unstable line voltage, the CP-10S will auto-
matically remove itself from the signal path into a hardwire
bypass mode. If the unit remains connected to the AC
supply, it will automatically reinsert itself in the signal path
as soon as the power supplies stabilize.
The rear-panel AC inlet is equipped with an integral voltage
selector and a fuse holder, both concealed in a compart-
ment above the AC inlet. The selected voltage is displayed
in a small window and reads 115 VAC or 230 VAC. In
order to change the voltage, first disconnect the AC cord.
Open the door of the voltage-selector compartment using a
small screwdriver or pen-knife and remove the voltage-
selector cam. Rotate the cam and replace it so that the
desired voltage is visible through the window of the voltage
selector compartment door. When the door to the voltage
selector compartment is closed and the AC cord is recon-
nected, the unit is ready for use.
AC Fuse
The fuse holder assembly can accommodate both U.S.
and European size fuses in their respective trays. When
the unit is shipped with the AC voltage set at 115 VAC, the
U.S. size fuse tray and fuse are included (Meyer Sound
Part Numbers 422.006 and 420.002 respectively). Other-
wise the European size fuse tray and fuse are supplied
(Meyer Sound Part Numbers 422.005 and 420.003 respec-
tively), and the voltage-selector cam is set at 230 VAC.
Indicators
The front panel of the CP-10S includes six LEDs. The two
Green LEDs indicate the power status at all times, the LED
marked Power indicating the presence of AC power and
the LED marked Ready that the signal path relay has
engaged and that the selected equalization is in circuit. The
four Red LEDs indicate signal levels in excess of 16 dBv at
the input and output stages of the unit. If the Input Clip LED
for either channel is lit, reduce the level of the input signal.
If the Output Clip LED of either channel is lit, reduce the
amount of gain through the equalizer by reducing the Boost
setting in those equalizer sections that are in use, or
reduce the drive signal level.
Ground Lift Switch
A ground Iift switch on the rear panel lifts pin 1 from the
chassis, which is grounded through the AC connector “U”
ground. This switch may be used to eliminate hum due to
ground loops. Pin 1 on the XLR connectors is tied to signal
common at all times.
Front Panel Controls
Each of the ten tunable filter circuits has its own screw-
driver-adjustable Center Frequency, Bandwidth and Boost/
Cut controls, and each of these filters can be inserted or
removed from the signal path with an In/Out switch.
In/Out Switch
The In/Out switches are provided so that individual filters
may be switched in and out without changing any settings.
The efficacy of particular equalization settings may thus be
easily verified, both by measurement and subjective
evaluation. In the Out position, the signal is not affected in
any measurable way by any of the filter settings. (For
lowest system noise it is recommended that filters not in
use be bypassed using the In/Out switch.)
The rear-panel voltage selector compartment contains a
1
/
4
Amp SIo BIo 250V fuse. In order to replace the fuse, first
disconnect the AC cord. Open the voltage selector com-
partment (see above) and remove the sliding tray which
contains the fuse. When replacing the fuse tray, take care
to insert it in the slot to the right, aligning the printed arrow
with those on the inside door of the voltage selector com-
partment. Close the compartment and reconnect the AC
cord. The unit is now ready for use.
