Will everything blow up to smithereens if I connect... - AVS Forum
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post #1 of 4 Old 11-05-2012, 02:35 PM - Thread Starter
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Will I blow anything up to smithereens if I connect two sources (TV and Airport Express) to my Bose Wave Radio System’s single AUX input through a 3.5mm Y-cable?

To make matter more complicated, the audio from the TV goes through an Optical Toslink to Analog converter.


So mine would basically look like this (if it helps):

TV AirPort Express
(Optical Cable) (Male 3.5mm to male 3.5mm cable)
Optical to Analog Converter I
(L/R to 3.5mm cable) I
I I
I
(3.5mm to (2)3.5mm Y-cable)
Bose Wave Radio System
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post #2 of 4 Old 11-05-2012, 02:37 PM - Thread Starter
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Ok, so I see my diagram was a big FAIL. The questions still goes though.
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post #3 of 4 Old 11-05-2012, 04:16 PM
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I thought you got your questions answered when you posted in the Soundbars forum. The bottom line is that you'll only be using one source device at a time, whether you unplug/plug the 3.5mm cable or get a manual switch.
http://www.avsforum.com/t/1437123/42-lg-plasma-tv-apple-airport-express-bose-wave-system
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post #4 of 4 Old 11-05-2012, 04:32 PM
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The answer is "maybe". But you will probably do damage sonically to both of the signals.

When you parallel 2 signal outputs into a single input, the output impedance of the opposite device will load down the current one. For example A will load down B and B will load down A.

This often results in distortion at a minimum.

At worse case you could damage the output section of one of the devices. This is because the devices are not used to driving such a low impedance.

Typically outputs are low impedance and inputs are a high impedance. So the input device does not load down the output signal.

This is why a single output can drive multiple inputs without a problem.

They are not designed to drive low impedance loads.

Not a good idea in either case.

Danley Sound Labs

Physics-not fads
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