REL vs JL AUDIO

I have owned dual SVS SB15 and SB16 Ultras, HSU, JL Audio, Martin Logan Depth and REL subwoofers. I prefer the REL G1 mkII over every other subwoofer that I've owned. JL Audio subwoofers hit harder, but to my ears, in my room/system, no other subwoofer improved everything across the audio spectrum like REL. You can't hear my G1s when they're on, but turn them off while music is playing and I just shake my head.

I just switched from my Martin Logan Force subs and picked up 2 REL subs after demoing REL and JL Audio.  Extremely happy with the upgrade.

My JL crapped out. Been meaning to send in the amp to fix for $400 but haven’t gotten around to it. I hear it was a round of bad caps in the 1st couple years models. 

I have a REL and like it a lot, but I chose Rythmik because it's good a great reputation and is a servo sub that is eminently adjustable.

I know you are inquiring about REL and JL Audio, but you might consider looking at Rythmik Audio subs. They use servo driver technology. I have their FV18 for music and home theater. It's fantastic for both. 

Regards.