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Old 5th April 2007, 07:55 AM   #1
Maximo is offline Maximo  United States
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Default Blanced input & output for alesis 3630

Hey! I am looking for schematics to make a balanced input & output to one channel of my Alesis 3630 compressor. Anyone? Thanks!!!
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Old 5th April 2007, 04:25 PM   #2
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Is there some particular reason you want to do this?, generally it's only of use for small signals and long leads.

Check here for some examples of how to do it (if you think it's worthwhile?).
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Old 5th April 2007, 05:39 PM   #3
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Nigel's suggestion is a good one. You might want to add a DC blocking cap and diode clamping to each balanced input of the receiver stage ... to keep that 48 volt phantom power from a hot mic from blowing away your PSU. ... maybe like this:
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Old 6th April 2007, 06:37 AM   #4
Maximo is offline Maximo  United States
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Hey thanks folks. What happens is, I am a musician and my rack for vocals is:

Bellarri MP 105 ( phantom power pre ) - Behringer Ultra q pro Eq - Alesis 3630 compressor - Alesis Quadraverb2 - optical to computer / analog to amp

Now all units accept balanced in / out but the compressor. Doesn't it affect the sound? Wouldn't it be better to have it all connected balanced? Thanks!
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Old 6th April 2007, 05:56 PM   #5
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The basic reason that Alesis built that gadget with unbalanced I/O is just exactly so that a) it would not normally be in the audio circuit of a pro recording studio and b) so that microphones, etc. would not be directly connected to it. (There may be an XLR version for your purposes.)

Anyway, if it is usable to you, and otherwise connected, then leave it alone ... unless you have a crying need to use it 'cause you got it. (Normally, compression / expansion is added during mix down, not master recording ... exception: broadcast usage.) I would not use it at all if you are working with 24bit masters ... Or sources that need to be held under control for some reason like sound FX that are too dynamic for 110+ db masters, etc.

The mixing of balanced and unbalanced devices usually does not affect over all quality as long as the unbalanced interconnects are of good quality and kept rather short = IMOP under 3 feet = patch panel cables.

If you are mixing down to 16bit CD quality, then it is a very useful device when not overly used. ("CDs suck" - Bob Dylan)
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Old 6th April 2007, 07:14 PM   #6
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Quote:
Originally posted by Maximo
Hey thanks folks. What happens is, I am a musician and my rack for vocals is:

Bellarri MP 105 ( phantom power pre ) - Behringer Ultra q pro Eq - Alesis 3630 compressor - Alesis Quadraverb2 - optical to computer / analog to amp

Now all units accept balanced in / out but the compressor. Doesn't it affect the sound? Wouldn't it be better to have it all connected balanced? Thanks!

I wouldn't have thought you would be able to hear, or measure, any difference either way?- I would just connect it unbalanced.
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Old 7th April 2007, 09:47 AM   #7
Maximo is offline Maximo  United States
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Thanks folks. I guess I will do that until I buy another comp. ( other stuff needed before that ). Actually I get a very good quality recording with that setup into my Emu 1212, so I'll just keep it up. Thanks for the answers. Keep on rockin'!!!
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