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How to connect a subwoofer into a mono block system

I'm interested in adding a subwoofer into my audio system. I have a new Audible Illusions M3B driving Welborne Labs Laurel Iix ultimate mono block amps and ProAc 50 Signature speakers. I've been confused by material on the web as to how to do this so as to insure that the subwoofer is seeing exactly the same signal that the ProAcs receive. Any recommendations, both as to how to best do this, but also on subwoofer choices?
128x128aquaticdoc
elevick
2,638 posts
 
REL makes a great sub that gets its signal from the speaker leads.  It has jumper wires that plug into your speaker terminals with the wires from the amp.  These are very low level taps and won't affect your amp at all.
rhljazz
1,255 posts
 
No love for REL subs from me.  Had one, sold it.
aquaticdoc's avatar
aquaticdoc OP
15 posts
 
Thanks to you both for the guidance. What didn't you like about the REL sub, rhljazz? Which one did you have? My room is small, with very limited space for anything large, but I believe the ProAcs would benefit from bass support.
daveyf's avatar
daveyf
2,899 posts
 
REL subs are superb, IME. Having said that, to add just one to a pair of monoblocks is not ideal. Since REL subs are balanced by design, a single sub running off the taps of the amps ( not speaker) can be problematical. REL suggest two (2) subs if a mono block system is utilized.That is how I have done it with my mono block amps.
audibleguy
157 posts
 
Having two rel subs and monoblock amps I just use the Speakon sub connector with the three wires hooked up to the amps speaker terminals and to chassis ground, run the main speakers full range and just use crossover in subs to adjust for main speakers. 
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