Originally Posted by mfabien
So you are suggesting I make use of a Component switcher. I guess there is no reason that would not work... as well as Component cables already in use for multichannel audio connections between my HD DVD player and my Yamaha receiver.
Being strongly associated with Zektor, I've held off responding to these posts because of the obvious biases I'm going to have, but I do want to bring something up that hasn't been addressed in similar posts about using a video switch as an audio switch.
Analog audio outputs are typically designed to drive 1,000 ~ 50,000 ohm loads.
A typical active video component switch, similar to the monoprice, uses 75 ohm termination resistors on it's inputs, this is a very low value for an audio output to drive, and can be lower than the output impedances of some audio circuits. This can cause an overload condition creating distortion, but more subtly the heavy load can cause damaging heating problems in the output buffers, which have not been designed to dissipate the heat generated by this heavy of a load.
As a side note: There's also the issue of noise, video amps are rated in the 50~60dB Signal to Noise Ratio range. Excellent for video, but for audio, this is about the background hiss of a cassette tape.
Another side note: I would guess the volume coming out of a video switch is a bit louder that what goes in. To drive properly terminated video cables, a video amp must have a gain of 2, which for audio, is a 6dB increase in volume (3 to 6 notches on your volume control). Of course the 75 ohm, near short circuit, input termination resistors, can greatly reduce the volume, thereby making all things equal! I would worry if the volume coming out of the switch is *not* louder than what's going in!
Being an audio purist, I designed the MAS7.1 as a passive switch. It uses relays to switch the audio signal, so it's impedance is the same as a length of wire -- whatever the impedance of the device connected to the MAS7.1's output, is the impedance seen on its inputs.
Now of course I want everyone to buy Zektor!
But biases aside, if the hiss of the video amps (and slightly louder audio) are not a problem, I *highly* recommend opening whatever video switch you buy and find the 75 ohm termination resistors, and remove them!
I don't have a monoprice switch, but would be more than happy to try and spot the resistors needing removal if someone were to send me a nice hi-res photo of the insides of one.