How do I hook up a subwoofer for 2-channel

I use the high level connections(speakers). These seem to intergrated better then the low level(preamp out). They seem to be faster. The signal reaches your subs at the same time as they reach your speakers. With the low levels, it is just a little bit slower.

Like Raytheprinter asked you best need 2 preouts of your preamp 1 pair L+R go to the amp for main speakers, the other pair each L and R goes to each subwoofer's L and R inputs ( signals will sum up anyway ) or use y cables.

If you are going to use Rel - take a look at the following link for instruction on how to connect the REL.
http://www.sumikoaudio.net/rel/manuals/ST-Series-Manual.pdf

Raythrprinter
Yes I do have two main outs on my current pre amp main out 1 and 2. which is better using the rca conection or the speaker conection?

Thanks Russ

Russ, Most subs will have the L+R rca input and one of those might say mono. Think home theater where the processor has only one sub out. I run 2 subs with 2 channel and I hook the L pre out to the L sub in and the R pre out to the L pre in to the other. It's still the right channel but I use the L because the gain of my sub is different if I just use the L/mono input. Different subs may vary, just make sure you read the owners manual or ask the manufacturer. Good luck.