2 subs?

You do not need two preamps to run two subs. Here are cases with one preamp and two subs:

(1) Some HT processors have two sub outputs, in anticipation of users with two subs.

(2) Some 2 channel preamps have redundant full signal outputs. They can sometimes be used to run two subs, though I would check with the preamp manufacturer before choosing this setup.

(3) Some subs (e.g., JL Audio) are capable of a master/slave configuration, so that the output of one sub (the slave) is controlled by another (the master). In this case, the subs are mono.

No stereo subs, run a "Y" connector and run both on one line into your processor. The only way to go for HT. Two
really makes a difference.

No stereo subs, run a "Y" connector and run both on one line into your processor. The only way to go for HT.
Two really makes a difference.

sorry for the triple post

Connect one sub to the Right channel pre/sub out and the other sub to the Left channel pre/sub out.The Right sub will recieve information from the Right channel and the Left sub will recieve information from the Left channel.Simple but effective.

Some like the RELs can be run off the power output of the amp, one on each channel. I run mine this way. Two are better than one but if the choice is between one really good one and two so- so ones I would go the good one, you could always add another later. I have often turned one of mine off for some reason and not noticed that only one is running. I use mine for music and cross them over much lower than the typical HT set up. My HT also uses subs , there I use either an electronic crossover or a passive box run off the power outputs of my main amp to drive the sub amp. The RELs are of course powered subs.

My peach pre only has one set of out puts so I had to use a set of y connectors on each side, is it better to have a sub out as far as music goes? Thanks,Scott

Just put the single sub in the center between the 2 mains. Move the gear to a corner. Your sound will improve 10 fold