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Topic: How do you turn on your sound rack?
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Scott Norwood
Film God
![](http://www.film-tech.com/ubbmembers/30f.jpg)
Posts: 8146
From: Boston, MA. USA (1774.21 miles northeast of Dallas)
Registered: Jun 99
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posted 05-04-2012 06:51 PM
I have never seen a power sequencer in a motion-picture sound system, but that is the easiest way to do it (and is common in other types of installed systems; the cinema people seem to be behind the times on this one).
As said above, amps go on last and off first. Turning on all amps at once will probably blow a fuse and/or trip a breaker, so they should be on separate circuits (or just use the switches on the front and power them up one at a time manually.
A while back, Brad posted that he has the electrician set up electrical panels so that breakers can be turned on in order and turned off in reverse order. This is a good idea for making a fool-proof booth.
Be especially careful with the CP50 and CP200--both of these make a loud "pop" when powered on or off and can easily blow speakers. The CP65 (I don't remember about the CP55) and later do not seem to have this issue.
Also, I prefer to have the processor wake up in non-sync, rather than a film format, as it reduces the chances of someone trying to thread the machines without checking the format and changeover state on the processor (and probably making a thump-thump in the speakers as well). Most places do this anyway, as they use the cinema system for walk-in music.
Last point: if you are showing many mono films, and you have any hiss or hum in your system at all, leave the unneeded amps turned off when showing non-Dolby films. Your audiences will thank you.
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