Join Date: Sep 2010
Location: Rocky Mountains
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I have zero experience with the Rythmik subs, but they were high on my very short list during my basement finish. All user comments indicate Rythmik subs are a sure buy.
My room shares similar dimensions, but is a bit narrower (2600 ft^3 versus your 2800 or so ft^3). For my room, my movie and music preferences, and my goals, my twin PSA V1811s fit the bill nicely. Nathan East's bass (on my favorite Fourplay tracks) is deep and punchy while remaining detailed and articulate. The 5.1 mix of Dream Theater's latest release (Distance Over Time) is another good demo for my room--bass, synthesizers, and drums really shine with the V1811s. Then there's movies. These subs (in my room) offer the proper measure of LFE presence and impact during Blade Runner 2049, Everest, Kong: Skull Island, Wonder Woman, Ready Player One, and other selections.
Are there better subs for roughly the same money? Perhaps. As you likely know, sealed subs versus ported subs is a discussion that often revolves around the trade-offs involved between the two designs--individual tastes/goals are a large determining factor in which design a consumer will choose. Your room is a bit wider than mine, so you may have the room for the F25 enclosure (either upright or on its side). I was a bit more concerned with enclosure size due to the layout of other speakers and furniture in the room, so I felt the V1811 subs would work better from that standpoint...and provide the flexibility I might need for optimum placement options based on REW measurements.
The internet-direct subwoofer companies really provide a sweet spot for all consumers these days--great products for all budgets and tastes. You've gotten some good insight from those who posted here before me. Decide which sub you want, make your purchase, perform your install/set-up, and enjoy your investment. Buy one of the subs you're comparing in this thread and I really think you cannot go wrong.
Best of luck with your decision.
Basement bat cave: JVC RS2000, 100" 16:9 Stewart StudioTek 130, Denon AVR-X4400H, Oppo UDP-203, Polk RTi A7 towers/CSi A6 center/65RT in-wall side surrounds (2)/70RT in-ceiling Atmos (4), dual PSA V1811 subwoofers