good rca y-adapter

From your description of what you're trying to accomplish I think what you need is an adapter that is 2 female, 1 male, like the one Ericjcabrera offered.

An alternative to a cable Y adapter is this kind of splitter. It gives you a direct connection and is probably less expensive than the high-quality cable splitters. I've used this Audioquest version in a couple of setups and it works perfectly. Monster makes a high-quality one, as well.

I used Voodoo for an adapter for my Shunyata Python with a NEMA plug to a 15amp IEC and they were fast and I was pretty happy with the product.

thanks for the input, helpful.

i am thinking i have a design flaw. i wanted to combine the left and right preamp outputs for the sub downstream of the splitters, in order to only have to run one cable to the sub. But am wondering what that will do to sound quality of stereo signals from splitters upstream run into the inputs for the amplifier section of integrated. not smart enough to figure this out but intuition tells me this is a bad idea. please advise.