Your experience of moving to two subs

What sounds good to me is what’s optimal in my system.

tis true, as one of the youtube heads say... ’’ all that matters is that you like the sound of your own system’’ or something to that effect

what gets a little more complicated, and perhaps interesting, is when we get the itch to try to IMPROVE our system.... how do we go about doing that?

some ask others for advice, some tinker with their existing gear and room, some try to measure to understand what might be going on as a way to shed light on potential avenues of improvement, and some just go and buy new stuff on a trial and error basis

we all enjoy the process differently, think differently, arrive at conclusions differently on how to improve, what to do next...

... and @hilde45 ... good analogy on the hvac vents in a room... i like it, it works!!!

Indeed!

I moved from one good REL B1 to three total and then four subs (all set 60 or lower) and when set up properly I do enjoy it more, like most.   

If one can 'hear' and localize deep bass I might suggest the overtones or a second order sub crossover getting in the way. I believe something is heard, not the deep stuff though. The four subs I have are not set so loud or set so high as to ever know where they are for me.

The 'air' and additional horsepower are nice additions. Good luck and good idea on trying out the SVS SB-2000 as a test (I have two of those and an SB-3000).

Looking forward to your impressions once the subs are dialed in. 

@tony1954 Agreed: a distributed bass array is the way to go. But if you can’t get there then two is better than none. Regardless, as others have stated, you need to put in the time & effort to optimize it. For me, it was one of the most cost-effective, biggest bang for the bucks that I’ve spent in this hobby. Huge, comparatively speaking. (Assuming you have a fairly well treated room too. Which is another big bang for the $$.)