Bryston 2WSB switch box to choose amp that drives speakers

Here’s a basic selector,

https://www.russound.com/products/connectivity-and-control/speaker-selectors/dual-speaker-dual-sourc...

You could also look for a Niles SAS-1 or a Niles SPK-1. These are no longer available new but can be found used. They would offer options for switching automatically.

As I posted this, I just noticed Al's post. Hopefully he will see my post and comment if my suggestions are suitable.

Niles Spk-1 switch both positive and negative, the 12v trigger is set and forget.
http://ww.nilesaudio.com/product/speaker-level-b-switcher-12v-triggered-FG00240

Al I really appreciate your looking into to this to that degree! This is really quite maddening that there isn't a quality switch that can accommodate it. I mean really I'm just looking for a four pole double throw switch that won't muck up the sound. I'll end up making something if I have to.

Thanks for the links guys...I'll check them out.

First, a couple of corrections, with respect to the Bryston switchbox:

1) Ignore my previous comments about make-before-break vs. break-before-make. I hadn’t noticed that the Bryston unit provides a separate and independent switch for each of its two signal paths.

2) Bryston’s setup diagram that is shown in one of the photos at the link provided in the OP states that it is the black binding posts that are common to all inputs and outputs, which of course directly conflicts with their schematic that is also shown.

In any event, per my other comments I would rule that device out.

I can’t tell if the Russound switchbox Tony (Tls49) linked to would be suitable, because there is no indication as to whether or not it switches both + and -. Also, if the impedance of your speakers is in the vicinity of 4 ohms your S200 amp (rated at 100 watts per channel into 8 ohms) might be a bit too powerful for it, given the 150 watt power handling spec of the switchbox.

Regarding the Niles SPK-1 both gentlemen referred to, if I understand correctly it is designed to be switched by the switched AC outlet of a Receiver or other component that it would be used with. If neither of your amps provides such an outlet that may be an issue.

Perhaps a look through all of Niles’ switchbox offerings would prove useful, if you haven’t already done so:

https://www.nilesaudio.com/products/all/speaker-selectors/all

I did take a quick look through the various pro-oriented switchers that are carried by B&H Photo Video, but everything I saw there had some combination of uncertainties, involving power ratings that would be marginal at best and/or whether or not the unit switches both + and -.

Best regards,
-- Al