St Pat,
Sometime several months back i was looking for a speaker switcher with the same gain controls. Take a look for
Russound products. It is not a major brand name company and it seems they sell to pro shops who use such items for clubs, restaurants etc.
I was hoping for something with a bit more quality, but i plan on modding this one to suit my needs. I can pass you pictures of you want.
I think they are around my computer somewhere.
I managed to get the
SDB 2.1 from Audiogon if i recall. It might have been ebay. It was missing the rear connectors (which are awful i might add) but the fellow managed to scrounge up 3 connectors after several weeks of searching for a place in his Californian city (don't recall which one) that actually serviced the things. It was VERY difficult to get ahold of the parts apparently.