Musical Subwoofer for 2 Channel System BUT....

Ok. A little more research and I found my answer on the REL website:

A. It is helpful to know that you will almost always connect the REL to the input on the rear panel labelled "Hi Level." This connection is made using the supplied cable, the bare leads of which connect to the speaker output terminals of the power amplifier (red to the amplifier’s primary right speaker red terminal, yellow to the amplifier’s primary left speaker red terminal and black to one of amplifier’s primary speaker black terminals (not both)). The easy connection at the REL is completed with a Neutrik Speakon connector. The purpose of connecting to the speaker output terminals is one of the unique secrets of REL’s success. By connecting to the REL’s High Level input from the amplifier, you build forward the sonic signature of your main system, including the tonal balance and timing cues. In this way, the REL shares the signal that is fed to the main speakers.

Here's a few more for you to consider

ACI FORCE And Titan Subs

Adire Rava II

Acoustic Vision MRS-10

PINNACLE ELBRUS

Acoustic vision Subwoofer Complete Kits series

TBI subwoofers

Rocket UFW-10 Subwoofer

VR-S/1 High-speed MiniSub personally I think the Q is too high on this sub. Thought I would list it anyway.

Here's a website that may help you along the way Subwoofers.org

I just wanted you to know there are other great subs out there besides Rel.

Good luck

Gmood1 -- thanks for the added choices.

I was wondering if there were any opinions on Soliloquy's S-10 sub?

I use the Karan Kai-180 to drive my Quad 988's with a pair of Rega Vulcan subwoofers.The subs hook up similiar to the Rels(speakon connectors that take the signal from the Karan binding post).I feel that this is the best way to hook up subs.