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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?
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aquaticdoc OP
14 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.
aquaticdoc's avatar
aquaticdoc OP
14 posts
 
So now, after discussions with REL tech support, and the very useful contributions above, I'm left with 2 options:
1. Use separate subs, one per mono block. This would mean from a financial and size standpoint using smaller subs. I'll need to stay under $450/sub. This would acoustically bring in the amp signature, a positive.
2. Using the preamp outputs directly to a single sub. My AI M3B is a great preamp, and I'll need to prevent bass doubling through controls on the sub. But this option allows a larger sub, albeit a single.

In all a decision like many driven by economics, aesthetics and some ignorance.
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