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From: mwm@ucbtopaz.CC.Berkeley.ARPA (Mike (I'll be mellow when I'm dead) Meyer)
Newsgroups: net.audio
Subject: Re: Equipment Review: NAD 2200
Message-ID: <944@ucbtopaz.CC.Berkeley.ARPA>
Date: Tue, 21-May-85 00:54:42 EDT
Article-I.D.: ucbtopaz.944
Posted: Tue May 21 00:54:42 1985
Date-Received: Fri, 24-May-85 07:54:37 EDT
References: <940@ucbtopaz.CC.Berkeley.ARPA> <1859@watcgl.UUCP>
Reply-To: mwm@ucbtopaz.UUCP (Mike (I'll be mellow when I'm dead) Meyer)
Organization: Missionaria Phonibalonica
Lines: 23

In article <1859@watcgl.UUCP> dmmartindale@watcgl.UUCP (Dave Martindale) writes:
>I'd be very surprised if the amplifier inverted only the low frequencies
>in one channel.  More likely, it inverts the channel entirely, and then
>"re-inverts" the signal simply by reversing the colour coding of the
>speaker binding posts on that channel.  This does cause the two
>channels to load the power supply primarily out-of-phase, allowing the use
>of a smaller power supply for the same output power (clever) and also
>means that bridging the amp for mono requires nothing more than connecting
>both channels' inputs together.

On closer reading, you're right. However, they leave the colour coding
alone, and relabel the +/- posts on one channel.

>Unfortunately, it must mean that the amp is incompatible with headphones
>or anything else that requires a common speaker ground.

Yup. In nice, bold letters above the diagrams in the owners manual it
says "Caution: do not connect the output of this amplifier to any ...
device that uses a common ground for left and right channels."

However, at the price/performance ratio of the 2200, I'll live with it.

	<mike