information on bridging amplifiers

Posted by Alan L. Maier [SysOp] [IP: 129.37.205.189] on May 08, 1999 at 07:40:24
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In Reply to: information on bridging amplifiers posted by Tim Baldwin on May 07, 1999 at 20:43:15:

Tim,

Here's the "scoop" on bridgable amps. When a power amp is designed to be bridged, one channel is inverted in phase in relation to the other. If you look at the speaker terminals you will find that one channel has the "-" terminal as red and the "+" terminal being black... and indication that one channel is inverted. Since you need to invert one channel for bridged operation, this is already done for you.

I have owned 3 amps over the years that were designed to be bridged without an outside polarity inverting device. 2 were Carvers and I currently own a Sony ES which can be a 110w/ch stereo amp (150w/ch into 4 ohms) or a 300 watt mono amp. While I have never used the ES as a mono amp, I did try it with the M-500t I had - that was the ONLY time I could cause that otherwise stable amp into giving me fits. Audible distortion set in well below really loud levels. The speakers were early 1980 vintage Infinitys that were known to be a tough load to drive. I feel the problem was due to power supply limitations, something that all home audio amps have to deal with.

Alan

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