I have the Metal V2's, although in a smaller dedicated room. Have you looked into Totem's Tribe Solution Sub? Years ago I had a Rel subwoofer.I wasn't too impressed with it. If I was in the market I would look at Rhythmic.
Rythmik or REL Subs to pair with Totem Element Metal V2?
I'm looking at one REL S/810 or two Rythmic F12SE subs as that works out to be about $3k total which is my budget.
What I'm looking for is more low-end growl, weight, and visceral punch - in proper proportion. I want a bass guitar to sound like a real bass guitar and I want to fill in the bottom end. The Totems are awesome from about 60Hz up, but they just don't move the air at the lowest end.
My current rig is:
Xfinity Modem ->AQ Vodka-> LHY SW8 switch ->AQ Vodka-> NAD M33 ->Cardas Cygnus Biwire-> Totem Element Metal V2. Power cables are AntiCables L3, AC filtering is a Panamax 5300.
My room is 32' wide, 17' deep with the speakers along the long wall. with the front baffles about 18" out from the wall. Some spousal-approved room treatments are in use. Also, and importantly, I'm in a high-rise condo, so I don't want to be inadvertently massaging my neighbors with pounding bass.
Any recommendations or thoughts?