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Author
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Topic: Peavey M 4000 Amps and 1/4 inch Jacks
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Jack Ondracek
Film God
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Posts: 2348
From: Port Orchard, WA, USA
Registered: Oct 2002
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posted 02-16-2004 01:27 AM
Without specific knowledge of the amp, William, I assume you mention ring/tip/ground because you've already confirmed the amp has balanced inputs and is equipped to accept a "stereo" 1/4" phone plug. In this case, without a schematic, it might be difficult to know for sure without scoping the input/output of the amp to confirm polarity... or finding someone who's already figured this out. You won't have a problem unless you're mixing amplifiers. In that case, you probably ought to get a dual trace scope and confirm which polarity at the input gets all amps going positive at the output. That will tell you how to wire your ring and tip. The shield of your cable goes to the ground (lower) part of the plug... or not... depending upon which way gives you a lower noise floor.
As for the outputs to the speakers... it's the same issue. If you're mixing amps, you need to make sure you're sending the same polarity down the line to all speaker systems. If not, just make sure both channels are feeding their respective speakers in phase, one way or the other.
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Jack Ondracek
Film God
![](http://www.film-tech.com/ubbmembers/1466.jpg)
Posts: 2348
From: Port Orchard, WA, USA
Registered: Oct 2002
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posted 02-16-2004 01:34 AM
If it's truely balanced, it won't matter. If it matters to you that a positive input to the tip causes a positive output at the other end, you'll need to scope it. Several people here have observed amplifier types that don't seem to follow any standard, though the channels should be consistent. If it doesn't matter, just make sure your polarity is not crossed at the inputs, then separately, at the outputs. At least this way, you won't be out of phase when you get to the speakers.
If you're feeding the amp with an unbalanced signal, it's another story altogether, and it also depends on whether the amp has a transformer-balanced or active input. Some active designs don't care for having one side grounded (as long as the shield is connected), and the output level will be effected by this issue.
Great question though... smart of you to wonder about that.
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