Not worth it. Money is better spent on another part of your system like your phono or digital. Even better, room treatments. Way better to control your bass with room treatments.
JL Audio Fathom
I've been very tempted to upgrade my 2x 12in Martin Logan 1100x subs to 2x JL Audio Fathom v2 subs. for reference the 1100x retail ~1300$ and the JL Audio 5k. I am very happy with the Martin Logans which are very nicely integrated with my Sabrina X speakers. Do you think it would be worth upgrading to the Fathoms?
No REL for me because I don't want made in China FYI.