Rel B2 or JL Audio f 112

REL B2 and JL both have high and low pass filters. Either product will extend low end of the Studio 20v5.

REL B2 implemented in my HT system and I have experimented with my two channel system.

Why not use a Paradigm Sub12,it's voiced to work with the Studio series.Just a thought.

for what the Sub would cost I would sell your 20's and look for a used set of Paradigm Sig 8's. Man, Paradigm makes such great speakers for the money.

If you really want a sub, I agree with TP, go with one set up to match your speakers. Paradigm makes great subs.

Shoot what am I saying, I own a Rel I need to tell you to buy a Rel.

LOL