What would be the best amp for this?

What is the best way to supply signal to two separate car amplifiers with only one set of pre-amp outputs?

• I am installing an aftermarket car stereo consisting of 4 aftermarket Polk Audio Db571 speakers and 2 12'' Diamond audio subs. I have a Boss Audio CX 600 4 channel amplifier for the 4 speakers and an American Bass amplifier for the subs. The receiver that I have only has two sets of pre-amp outputs, front and rear. To send signal to both of my amplifiers, I am going to have to split the rear signal somehow. The two options that I can see right now are: 1. Get an RCA split cable to split the low level signal coming out of my receiver into two cables, one for each rear input on the amplifiers (one set of red and white cables for the rear speakers and a second set of red and white cables for the subs). That would solve the issue, as there is no issue with the wiring for the front speakers (two front channels, two front speakers with one pre-amp our for front = no problem. four back channels, four back speakers and one pre-amp out for the rear = problem at hand) This option literally takes the one set of pre-amp outputs on my receiver and turns it into two. 2. The amp that I will be using to power the subs with has a line out on it. I could take the signal from the rear channel on the receiver and send it to the sub-woofer amp and then use the line out jacks on it to send the signal into the rear channel input of the second amplifier to power the rest of the rear speakers. Again, no problem with the front because I have the correct number of channels on the deck and the amps. The main question, that is the title of the post, is which option will cause the least amount of distortion? I know that if I add a splitter, it will definitely cut down the signal, and in general any time you split some signal with another piece of cable it will add "noise," but I have no experience with the line out function of car stereo amps and I'm not sure how much noise that would add or how drastically it would decrease the quality of the signal. This system is being built for sound quality, not how loud it can get. Every little bit counts. Thanks for taking the time to read that huge, wordy question. Any input would be lovely.

• Answer:

  either option will basically be the same most likely... you didnt list the AB amp model # but most amps simply split the signal same as a "y" would do... some amps do crossover the signal if you like... but you almost certainly wouldnt have an audible difference between the Y or amp without x-over I would use the amp out to simplify wiring.