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How to share speakers without bypass?

I hope I am not the only one in this predicament. I am adding a separate two-channel system into the same room where my home theater lives. I would like to share the two front speakers between the two-channel amp and AV receiver. No, I cannot consider using a HT bypass (or pass through). The two-channel amp is tubed and would need to be powered on and warmed up (20 min). This is not a problem for us adults, but when our 8 year old (or the other kids that flood in) needs to watch a DVD 'NOW', well, you see the problem.

So, my options are:
(1) Buy some additional front speakers to keep everything separate. Only drawback is the speakers would have to be small (space limitations and wife). This means HT would suffer a bit; Merlins vs satellite speakers.

(2) Find a quality switcher that connects two amps to one pair of speakers. Don't know if this is possible and would not want my two-channel listening to suffer.

Or? Please help if any of you have pondered this.
jazzalot
kr4's avatar
kr4
3,680 posts
 
"I didn't try it but in theory the following should work - if you use biwire in reverse - connect each speaker to both amps outputs. As long as you power only one amp at a time there shouldn't be any signal crossing. And output stage of either amp when it's OFF should not have any problem with the external signal on its output.
Please anybody correct me if I'm wrong on this."

Here goes: Don't do this. First, even with the tube amp off, its transformer secondary will shunt the output of the other working amp. When using the tube amp, there may well be sufficiently low resistance at the unpowered SS amp to affect operations as well. Second, Don't leave open the possibility of operating them both as the same time.

Get a switch. Instead of a backwards bi-wire, use a backwards speaker selector switch!
eldulcesol
197 posts
 
Zoya, I would like to add to your suggestion, or theory. If you bi-wire in reverse, why would the amp and receiver be on at the same time? If they have to be on, why not put one in stand-by, mute or speaker off while the other is in use.

By doing this, you would avoid breaking the speaker wire.
tqn999
17 posts
 
Jazzalot
Yes, that's the one.
I also connect to this selector from receiver/amp using 12awg silver plated cable, and regular speaker cable out from it to speakers (Tara labs bi-wire, but twisted as one). I don't think I hear any reduction in sound quality.

Drawback ? Yes, the two buttons for A/B can be turned on at the same time, my wife mistakenly did it couple times and both system didn't get any problem ... yet. I had to remind her more than once, release the down button first, then push the other later.
stickleda
2 posts
 
The soluttion is relativly simple if you don't mind giving up the absolutes in performance with the main system. Power 2 DPDT relays from the switched outlet on your surround receiver. Both amp outputs will feed into the relays and the speakers are the output. When you power up the surround receiver it will send the output from that receiver to the speakers. Turn the surround receiver off and the tube amp is again connected. Just don't try to drive the tube amp with no load (speakers) connected, highly unlikely as I am sure that you are the only one who turns it on, and you would have turned the surround receiver off before hand. The solution is about as kid proof as you will get. If you would like a schematic, or are not a hobbyest I could help further given time.
jazzalot OP
3 posts
 
Thanks everyone for the input.
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