This is sort of an odd question, but here we go. I have 1 room I use for Home Theater and Music. The front speakers and amp that I use for music double as my front amp and speakers for my Home Theater. The problem is I don't like using the surround sound preamp for music and would rather use a 2 channel unit (Threshold). My plans were to just install an RCA splitter jack at the power amp and run both preamps to that amp. My question is do I run the risk of degrading the signal if it is able to "flow" back into all the electronics of the surround sound preamp, even if turned off?
Plan B was to construct a switch box with 2 - ins and 1 - out going to the amp and a set of switches that switch between either preamp. Not sure if the extra RCA jacks, wire, switches etc. do more harm to the signal than the method mentioned above!
Post by Michael Lawrence on Jan 31, 2019 4:08:07 GMT
Hi Eric -
You are correct that simply connecting two different devices in parallel to the same input terminals is not a good idea. Generally, both devices will have low-impedance outputs and will try to drive each other. This can cause audible distortion, among other issues, so best not to do that.
You could easily construct a passive summing mixer out of resistors, or you can buy an RCA switching device that should not affect the sound of your system as long as it's competently designed (no bad solder points, etc). A quick search for "RCA Switcher" on Amazon returned many inexpensive options. I'd start there.