Bottlehead Forum

General Category => Technical topics => Topic started by: feeench on July 05, 2015, 06:33:13 PM

Title: Use multiple inputs at the same time
Post by: feeench on July 05, 2015, 06:33:13 PM

Say I wanted to combine the output of two devices using my Smash... How would I accomplish this? Willing to do surgery. :P Would I just need some resistors?

Title: Re: Use multiple inputs at the same time
Post by: fullheadofnothing on July 06, 2015, 04:58:45 AM

Y-cables. Two female RCAs to one male RCA. Buy or make two of them and you're off.

Title: Re: Use multiple inputs at the same time
Post by: Paul Joppa on July 06, 2015, 01:37:59 PM

The multiple inputs should be isolated from each other with resistances, equal to or greater than the minimum load resistance of the device being considered.

Otherwise, the internal impedance of each source will load down the other source, splitting the levels according to the internal impedances of the sources. Those internal impedances are too low (often near zero), not matched for different sources, and not always constant with frequency.

Y cables or paralleled lines work find to go from one source to multiple loads, they do NOT work well or reliably between multiple sources to one load.