We discussed hooking up my LSI25's using ycables from my subwoofer out on my Onkyo TX-SR806 to both my towers and my sub. Since I had many subwoofer cables available to me I connected two Y connectors from my sub out and ran 3 sub cables to the towers and the sub. Two questions. Every time I touch one of the cables to one tower I get a loud buzz from the sub (or tower I can't tell which as they are close to each other). Why is this? #2. Does connecting two Y connectors to the sub out on my receiver lose signal going to the towers and sub?
Hi Jeff, the buzz indicates that there is a ground loop being caused when you touch the cable to the speaker. Their power supplies are not at the same ground level. This is a very common problem especially when mixing gear with 3-prong and 2-prong power cords.
There is no signal lost when you connect y-cords.
Is that a problem? If so, is it correctable?
It's only a problem if it's happening during playback as the buzzing would be come annoying. Correcting ground loops is a huge pain. It's like detective work where you need to go through every component in the chain to figure out what combination of wiring is causing the problem.
I have several (3) surge protector strips in my system. If I connect all the 2 prong plugs into one maybe that would solve the problem?
It's really hard to diagnose this issue remotely. I highly recommend reading through this in-depth paper by Bill Whitlock who is the world's expert on ground loops: http://www.jensen-transformers.com/an/generic%20seminar.pdf