8.0 Installation - audio
8.1 Interface Power Amps
The Cinemix in its standard configuration can interface with all available
equipment. Attention concerning the CRM output must be noted.
This output delivers a nominal +4 dBu level which is sometimes too high for
power amps rated at 300mV sensitivity for full output. In some instances an
input attenuator at the power amp's input is required to reduce this +4 dBu level
by up to 12 dB. Contact the D&R Technical Support Department for details.
NOTE: This alignment is imperative in order to avoid damage to the speakers,
or in some cases, damage to the ears of the listener.
8.2 The Initial Hook-Up
First connect the rack-mounted power supplies to the console. All faders,
monitors, and effect returns must be in the "down" or "off" position.
In order to ensure the best signal to noise ratio for your system, the next steps
should be performed in the order they are printed.
a. Connect the CRM outputs (located on the master section backplate) to the
inputs of your control room speaker power amps. Now turn on the console
power supplies and then turn your main power amp on and check for any hum,
buzz, or interference. Slowly turn the CRM control clockwise until it is wide
open while listening for excessive noise. You should only hear a faint "hiss". If
everything is O.K., continue. If any hum or excess noise is present, stop and try
different ground and shielding arrangements until the system is clean.
After checking the main power amp and speakers, check CRM 2 and 3.
b. Before making any other connections, move each monitor fader to the 0 dB
position with the master tape switch ON. Connect the multitrack cables to the
25 pole sub-D connectors on the rear of the patchbay, then connect each
connector on the tape output of your multitrack. Check for hum or noise after
each track has been hooked up. "Hiss" will normally increase slightly with each
track. Connect the tape input jacks to the inputs of the multitrack. Carefully
listen for excessive noise or hum. If after hooking up an input or output
excessive noise or hum is detected, stop and take corrective action before
proceeding. Do not hook up all 16, 24, 32, or 48 tracks and then listen.
You may need to rewire the entire cable harness to make the system clean.
c. Connect stereo tape recorders (inputs and outputs), stereo headphone amp,
and all signal processors.
NOTE: MAKE SURE THAT YOU CHECK FOR HUM OR NOISE AS EACH
INPUT OR OUTPUT IS CONNECTED.
Cinemix manual page: 49
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