REL Vs SVS for 2 channel music listening

I'm with @contuzzi @ricred1 @crwindy on the JL Audio. More musical.

But likely out of the OP's stated budget unless he/she can score a great deal used.

+1 regarding @crwindy 's post. Less is more. 

Since you seem to be leaning SVS, I second @yogiboy  's recommendation to go with the discontinued SB12 for $400. I'd double up. If you are going with one sub, then the Outlet PB-12Plus in Piano Gloss (with no damage) for $999 is another option.

thanks. Looks like most are pleased with SVS

A last thought on SVS (or any sub)...

Generally, ported’s okay for home theatre but sealed is better for music.
("generally" because there are probably exceptions)

I agree. I've had both. The ported sub was a bit "loose" or sloppy for music. Felt slow as well. Great for action movies where you want to feel the low rumble of a submarine, etc. The sealed unit sounded like more of an extension of the speaker woofer. 

I just bought a Fg rhythmik sub sealed for music , design for tubes amps.$950 it’s very very good, Sbayne Agon member replaced his rel for rhythmik..,easy to use, people there were very knowledgeable....