I just went through a negative experience with the Y-splitters when I added a powered subwoofer to my system. I first tried a Monster Cable Y-splitter and heard, to my surprise, significant losses of depth and fine transient information. Same problem with the AudioQuest and Dayton Electronics splitters. The solution: my main amp has dual inputs, single-ended and balanced. So I use the single-ended connection uninterrupted from preamp to amp, then I use an XLR-to-RCA adapter on the balanced amp connector to daisy-chain the signal out to my subwoofer amp. IOW, the balanced amp input can also serve as an output passthrough for the preamp signal. The signal to the main amp remains unmolested.
