Amp with RCA and XLR Inputs PLUS a switch to Select

I never tested the Parasound with both hooked up when I owned the amp. This new great idea :) is brand new.

Here is a comment from an amp manufacturer that I just asked.

- bridgeable amplifiers are sometimes an exception. I think you'll find that quite often that switch isn't switching the input so much as it is making sure that the unused phase of the XLR connection is grounded so it won't make noise. 

Some solid state amps use an entirely different circuit to convert from balanced (usually using an opamp) to single-ended and then apply that to the regular single-ended input of the amp. Such amps might also have a switch. IMO this is a poor way to execute a balanced input; if the actual amplifier itself is balanced that seems to work better.

The AGD Tempo has a switch.  No idea exactly what the switch does.  But it's also bridgeable, so I'm not sure if this is what you're looking for.  AGD will get back to you re. technical inquiries within 24 hrs.

I was looking at the AGD since I liked the GAN tech, I owned the LSA Voyager 350 GAN a few months ago. The Voyager is not ’sufficiently’ different sonically from the AHB2 so I am not considering it. I forgot if it had a switch. I do not know too much about the Tempo.

I am also considering the Atma-sphere Class D but that does not have the switch I was thinking about. Though that amp maybe perfect (minus switch) sonically for what I want.

The Bryston maybe a bit too hard on the bright headphones I will be connecting to the amp. I am trying to get a home demo of a 3B3 or 4B3.

Look into the Modwright KWA 100 SE. it has that switch.

Two preamps and two amps? Headphone system? What are you doing? I'm totally confused.