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From: James Meyer
Subject: Re: Combine stereo outputs for twice voltage?
X-Newsreader: Forte Agent 1.92/32.572
Date: Wed, 25 Dec 2002 16:38:43 GMT
NNTP-Posting-Date: Wed, 25 Dec 2002 11:38:43 EST
On 25 Dec 2002 05:47:21 -0800, email@example.com (N. Thornton) wroth:
>Peter Nielsen wrote in message news:...
>> I am aware of paralleling amp outputs for more current, and bridge
>> configurations ... but is there anyway to add indentical signals from
>> the stereo outputs of an audio amp to derive one channel at twice the
>> Peter Nielsen
>Yes. Feed your signal into the 2 channels in antiphase, ie one channel
>is inverted version of the other. Then attach your speaker from Left+
>to Right+, with no ground connection. You'll need twice the speaker
>impedance that the amp would normally run with. Its called a bridge
>FWIW there are other ways to do it, but this is the practical one.
The original question was for "identical signals" from both channels.
That means that antiphase signals can't be used. Peter also stated that he was
familiar with bridge circuits so he was probably looking for a different way.
If the amplifier in questiion has transformer coupled outputs and if the
chassis ground that is usually made at one end of the output winding can be
disconnected without changing the negative feedback, then it's a simple matter
to connect the windings in series-aiding for twice the voltage and each channel
will have identical signals.
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