AudioQuest Hard RCA Splitter
Crutchfield Customer Review (What's this?)
I have all Audioquest cables and when I recently added a second turntable I needed a way to hook it into a preamp with only one phono input. These splitters worked fine in my situation but you're best to check the area you have to work with. One of these would be a good way to hook up a subwoofer as well.
Pros: No loss of signal and Audioquest quality.
Cons: Check hook-up area on your preamp if you're using a pair like I did. Otherwise no cons.