Dual or single subwoofers?

According to research by Harmon Kardon if you use two subs it is best to place them in the middle of two walls which are perpendicular to each other, rather than two corners. You will have to experiment.

I use two subs (Linn AV-5150) on my 2 channel system and love the results. When I got the first one and used it in a mono configuration (L & R signal blended internally) it didn´t sounded right. Then I got a second one and used them in stereo configuration and the system just sounds great. Hector

I am definately in favor of using 2 subs but what might be a better solution for you would be to keep your Rel and add a Velodyne SMS-1 EQ. Now that I think of it though most Rel's have a different connection configuration so I am not sure if it would work with the SMS-1. You definately want to look into it though.

For $600 it is the biggest improvement I have personally made in my system as far as bass is concerned. The bass in movie soundtracks is downright scary and the SMS-1 has 6 different presets so you can use it with music as well. I personally never used my subs when playing music as my mains are full range but with the SMS-1 in Jazz mode my subs blend beautifully with my mains like never before.

Shadorne is right when he says "The possibilities are endless but chances are you may be dissappointed with the results...and forever fiddling/tweaking" but with the SMS-1 it really helps put an end to your tweaking for good.

If the connection options with your REL allow integrating the SMS-1 into your system you owe it to yourself to give it a try.

PS: On the # of subs I use 3 and they are all connected and corrected by the SMS-1.