Use of RCA Y Splitters?

I've used Y splitters in the past and haven't noticed adverse performance; although I didn't perform any kind of an a/b test to scrutinize it. In my current home theater I'm running vertical biamping using Eagle 4 amps that have a jumper soldered internally between the RCA inputs. So one interconnect plugged into either RCA input on the amp drives both channels. This has worked nicely and in my mind is cheaper and probably the more electrically direct than Y splitters. Of course you have to get over the fact you're modifying the amp (mine was done by the mfg).

Should work fine. Many preamps with two pre-outputs are really just split inside instead of outside with Y adapters.

Thanks for all the input. Would there be an issue if the amps were not the same, i.e, not the same power output?

The preamp is sending a signal out. It should not really matter what is on the receiving end. You're talking about the output end of the amps. Should have no effect on the preamp in any case.

No, I was wondering about the effects of bi-amping with two different amps.