I need to get a good speaker selector box and was wondering if anyone had some thoughts on a good one to get. This isn't for my main speakers but instead going to be used to select between two pair of M3 On-Wall speakers. Thanks for any thoughts anyone has!

Adcom used to make those, and they seem well-built. You can often find used ones for <$50.

Thanks ... I'm wanting to be sure and not lose a lot of quality by going through the box, but I'm sure that's inevitable.

Ask Axiom if they will custom build one for you. It can't hurt to ask.

It's been known to happen before.