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CENTER SURROUND 3X
SETUP
Adjusting the CS-3X is a straightforward procedure.
It consists of setting levels and adjusting equaliza-
tion. A Real Time Analyzer is required to do EQ. A
Sound Pressure Level meter is required to set lev-
els. Remove the security cover from the front of the
CS-3X to gain access to the EQ and Level trimpots
and LED Indicators.
PLEASE NOTE: The Optical Processor Surround
Equalizers will NOT be used. These Surround Equal-
izers MUST be set to a flat response to avoid fre-
quency and phase errors which will degrade the
performance of the CS-3X. If possible, use the line
inputs on the RTA to look at the surround outputs of
the stereo processor and adjust the surround equal-
izers for the flattest possible response. Do NOT use
x curve compensation if that option is available on
the RTA. When using a PANASTEREO processor,
simply set the Surround EQ bypass switches to the
BYPASS position. The equalizers in the CS-3X will
be used for the surround channels.
This setup procedure uses 85dB SPL as the level on
which all adjustments are based. If you use a dif-
ferent SPL, make the appropriate compensations
in the example levels shown in the procedure.
Place the CS-3X POWER/BYPASS switch in the
BYPASS position and select LS-RS mode (pushbut-
ton out).
Turn the Rear Wall Amp volume controls all the
way down.
Turn Left Wall/Right Wall Amp volume controls up
to normal (usually 1/2 to 2/3 up).
Adjust the Optical Processor levels to your normal
levels (e.g., 85dB). The Left Surround and Right Sur-
round levels should match the stage levels (e.g.,
85dB on each surround channel).
Place the CS-3X POWER/BYPASS switch in the
POWER position and select LS-RS mode (pushbut-
ton out). Set all CS-3X OUT LEVEL trimpots to mid
position to start.
With the pink noise feeding the Left Surround and
Right Surround channels, adjust the LS and RS IN
LEVEL trimpots until the LS CAL and RS CAL LEDs
are just beginning to come on. This sets the proper
level feeding the input of the Circle Surround ma-
trix circuitry.
Turn on only the left surround pink noise.
Adjust the LS equalizers on the CS-3X for proper
frequency response on the Real Time Analyzer. Af-
ter proper EQ has been obtained, set the L WALL
OUT LEVEL trimpot for 2dB less SPL reading (e.g.,
83dB) than you obtained earlier when adjusting the
Optical Processor Surround output levels. Turn the
Left Rear Wall Amp volume control up to obtain a
2 dB increase in SPL (e.g., 85dB)
Turn on only the right surround pink noise.
Adjust the RS equalizers on the CS-3X for proper
frequency response on the Real Time Analyzer. Af-
ter proper EQ has been obtained, set the R WALL
OUT LEVEL trimpot for 2dB less SPL reading (e.g.,
83dB) than you obtained earlier when adjusting the
Optical Processor Surround output levels. Turn the
Right Rear Wall Amp volume control up to obtain a
2 dB increase in SPL (e.g., 85dB)
Turn OFF the Left Wall/Right Wall power amp.
Don’t
adjust the volume controls.
Select the CS-3X mode (pushbutton in).
Turn on the left surround and right surround pink
noise.
Adjust the Rear equalizers on the CS-3X for proper
frequency response on the Real Time Analyzer. Af-
ter proper EQ has been obtained, set the REAR LEV-
EL trimpot for 2 dB less SPL reading (e.g., 83dB)
than you obtained earlier when adjusting the Opti-
cal Processor Surround output levels .
Turn ON all surround channels power amps.
EQ and Level Trimpot Section of Front Panel
Control Section of Front Panel
