one or two transformers

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A dual mono amplifier does have a commoned signal ground that does form a loop
A dual-mono amplifier is to be made exactly as monoblocks except sharing one chassis. So, it is only the chassis ground (and earth ground) that is the commoned.

If the signal ground was commoned at the amplifier enclosure, then that defines a stereo amplifier, not a dual-mono amplifier.

The limiting factor in defining a dual-mono amplifier is: Two Mono Amplifiers. Therefore, signal inputs aren't commoned for reference point.

It seems that separate left and right channel ground loop breakers are required to meet my definition of a dual mono amplifier. I hadn't thought of that before. Thanks for your help.
 
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