Been asked before but... One sub or two?


Please - before someone tells me to read past threads, I have.  Still hoping to get some response to my specific situation, so thanks in advance.

My current listening room above my garage is approximately 15' D x19' W x 8' H with hardwood floors and drywall walls.  There is no room treatment other than upholstered furniture and an area rug, My speakers are approximately 9' apart along the long wall, 3' from the front wall to face of speakers, and 9' from my listening seat. Wall behind listening position is mostly windows (no curtains).  Speakers are Focal 1028BE (34hz-40khz~3db) on Gaia ll feet, with just a few degrees of toe in.. I also have a single Focal Chorus SW800V sub (32hz-160hz~3db) in the corner of the room along the same wall as the main speakers. Speakers are driven by a Marantz PM-11S3 (100w/200w @ 8ohms /4ohms).

 This sub was from an earlier system. I am trying to decide whether to upgrade and, if so, given the relatively small room size, whether one or two subs is the way to go.  My preference is a single sub that will complement the Focals but reach down closer to 20hz.  My budget is $1k-$2k.  Thoughts?
sjtm
while typically 2 or 4 are recommended, 1 often works quite well. Really depends on room and system; careful placement and crossover and volume settings are crucial...I was thinking of getting a second REL and just today a friends’ son who is an acoustical engineer (or something like that), took a listen and said stick with my single sub...REL recommends 2...I have a friend with almost identical system, and his sounds better with 2 smaller REL subs...
You can always add a sub, but this is what I'd do to start:

Keep the existing sub.

Add GIK soffit traps in the corners. I like to stack 2 of them.

Add miniDSP to EQ the existing sub.  Most of what you'll need to do is kill exaggerated room modes.


A single Sub-Woofer will typically add to coherence with many mains.
The size of the drivers is more the focus than the room size.
A well driven 12"-15" driver will generally be a better choice.
A single Sub with two 8"-10" drivers will produce the same effect.
Low Frequencies are very long wave lengths.
Please note it is not necessary to use a lot of power for High SPL.
A Sub with a 'Long Throw' is very helpful to go low.
Also Stereo Subs may provide a better listening experience.