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Older amplifier briding

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Jon Geissinger:
Does any one have a circuit, device, thoughts, transformers that will allow balanced input bridging on an older amp; the amp does support bridging (older Yamaha P2201).
Thanks!

John Roberts {JR}:
Your question is not clear.

If you are asking about output bridging, if the amp does not support it, do not do it, there are design considerations and you could damage the amp.

JR

Gus Housen:
thesnowfields.com/manuals/Yamaha%20P2200.pdf

You need two matching input transformers and reverse the phase of 1 of the inputs. You can probably get them from Whirlwind or another cable supplier

The manual is pretty extensive and should have directions on how to make What ever adapter you need

Geoff Doane:

--- Quote from: Gus Housen on May 03, 2011, 04:47:56 PM ---thesnowfields.com/manuals/Yamaha%20P2200.pdf

The manual is pretty extensive and should have directions on how to make What ever adapter you need

--- End quote ---

+1 on the manual.

It may have been written over 30 years ago, but the "manual" is a virtual sound reinforcement guide, with information that is still relevant today.  The idea that a 200 W/ch amplifier was considered "high power" at one time is rather quaint, and I don't think there is anything in there on DSP (after all, it was written in the late '70s), but the basic concepts are timeless.

And there is a whole section on bridging the P-2200, and various different applications in that mode.

One other note about the P-2200/2201:  They were notorious for going DC, and there is no output protection relay.  The bias setting can get out of whack, the amp runs hot at idle, and sooner or later something fails, sending 80V DC to your speaker.  Also, although the inputs are XLRs, they are NOT balanced, so you have to be careful what you drive it with.

GTD

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