I am looking to upgrade my dual sub setup but I am unsure what size subs to get to achieve a respectable output. My current setup uses dual Sunfire SDS-10s positioned at the front of the room, about 7 feet apart. These play well for what they are, given I have done the best tuning I can with the miniDSP and couch placement. I have been looking at dual, maybe three, Monolith M-12 V2. My concern is that looking at the Bassaholic room size rating guide, the M-12 is rated for a large room (3,000 to 5,000 cubic ft). My room is a common living room with an open kitchen area immediately to the right of the theater setup. The area where I sit and enjoy the setup is about 2,500 cubic ft (basically the carpeted area of the living room) then about another 3,500 cubic ft of kitchen space off to the right of my setup and seating area. I sit just under 10 ft from the speakers, with about a 2.5 ft gap between the back wall and the couch.
What I am unsure of is do I take the entire space into consideration when reading the room size rating or simply where I sit (essentially just the carpeted area)? Will the M-12 be enough for this room size and setup? The 13in is considerably more so buying two or three or those sounds like a financial disaster hahaha. I'm thinking the M-12 will be enough to rock my socks given what I'm upgrading from but I wanted some opinions if possible.
Just in case it matters, the rest of my setup is the Denon x3700h, Emotiva BasX 5 channel amp, Emotiva T1+, C2+ and B2s and a miniDSP for the dual Sunfire SDS-10s. I'm also hiring an electrician to run some dedicated 20 amp lines.