Your sub experience: Easy or hard?

We can assemble the modules of the ISS built in different countries and assembled in space with success. We can have a “relationship” through AI. We can pinpoint and “paint” targets for invisible air strikes. 
Why in the heck can’t someone figure out an intelligent sub that can adjust volume as needed per recording?

Much easier with two than with only one, and also much more noticeable sonic improvement with two.  I would like to try three or four.

I have 2 rel s/510s. They’re magnificent but with better bass comes the need for battling room resonance. Also, the loudness of the bass from track to track can be all over the place. I wish I had remote volume controls on them.

Piece of cake integrating Hsu VTF-2 Mk 4 with Eminent Technology ET 8.and in my TV system with JBL Hartsfield.

As well as plumbing the depths, the sub will benefit yr system by relieving yr mains of lower octave duties. Yr mains will play more relaxed and bloom. 

Hsu no longer makes the VTF-2 which had a downward firing 12 inch driver. I preferred it to a forward firing Hsu with 15 inch driver. e.g. on Kill Bill Vol. 1 you can feel the head as it hits the table. And I do mean feel.

I use a single REL SHO S/5 in a very irregular room, H/W/L all vary. By necessity set up is behind the tv and took only a few tries for great sound. Close to the wall and aimed to a 45 degree fireplace two feet away. Here’s the bizarre part. Just last week I experimented with rotating the speakers for zero toe in, same position. No bass. Cranking the sub produced nothing but distortion. Weird. Toed them back in and all is well.