I am planning to upgrade my subwoofer solution in my new dedicated theater room. I am currently using an old Elemental Designs A3-300 -- which actually has been doing yeoman's work, and doing it decently well. But I am not ready to upgrade to something more befitting the room.
My primary candidates are:
1. Rythmik FV15HP (and probably doing dual)
2. Seaton SubM HP+ (and probably adding a slave later to the system as budget (read wife) allows/need arises).
I wanted to ask some of the SubM users/fans about how they think the sub would work in my room, particualarly with regard to the placement (rear corners are the natural placement options). Below are the details (pulled from my sub advice thread) and some pics. I would love to find out from any users with similar sized rooms and rear corner placements how they liked their results.
: I have a dedicated home theater room that is windowless, dark and relatively tightly sealed. It is 19’ wide x 23’ long x 8’8” high. The screen wall is on the front wide wall. 15’ back from the screen wall is a 16” platform for the second row (platform is 8’ x 19’ x 16”). The platform is solidly constructed and filled with insulation, and does not resonate (at least I can’t hear it). I calculate it to be roughly 3785 cu ft of space. 3572 cu ft if you back out the space the platform takes up (I don’t know if you are supposed to do that or not).
As I thought about it during construction, I believed that the natural place for subwoofers would be along the back wall on either side of the rear row (I took pictures of the areas). So there are two coax connects (that terminate in RCA’s in the media closet) in the two back corners. The room is not sound proof – but it is resistant to sound transference. The ceiling is hung on an Auralex RC-8 channel system, all the drywall is 5/8” thick, double-layered with green glue, recessed cans have backer boxes, wall boxes have putty pads, ceiling and walls are insulated with mineral wool, door is solid core with an acoustic seal threshold. Supply and return to the HVAC system using acoustic ducting, and I have not heard any sound transfer through the HVAC. For the most part – only a small amount of sound (mostly mild hums from the bass unit) transfers to the room directly above – which is the formal living room (which no one is typically in). The room is carpeted with thick carpet and premium 10lbs pad. It is otherwise not yet acoustically treated – but I plan to do so with some DIY treatments. The left rear corner (when facing the screen), is a foundational corner of the house (the left wall and rear wall are foundation walls). The right wall is shared with the media closet, and the mechanical/storage room. Front wall is half foundation, and half shared with the rec room. I have attached pictures of the space for reference (and showing the two back corner areas for the subs).
Speakers: B&W Nautilus 803 (R+L), B&W CDM-CNT (Center), Definitive Technologies BPX (surrounds), Definitive Technologies BP2X (rear surrounds)
Amp: Sherbourn PA 7-350 (350w RMS x 7 channels)
Sound Processer: Onkyo TX-SR805 (using pre-amp outs). I currently use the Audyssey MutiEQ XT and cross all speakers at 80hz.
Bass Management: Velodyne SMS-1 (this is a “new to me” addition to the system). I bought it to help manage and integrate multiple and mismatched subs (at least until I upgrade my processor to something with Audyssey MultiEQ XT32 and SubEQ).
Projector System: Sony VPL-HW55ES, VAPEX 120” fixed frame 1.1 gain screen.
Video Processors: DVDO Edge Green, and Darbee Darblet
Sources: DirecTV HD DVR HR-21, PS3 (blu-ray player and media streamer), PS4, Xbox 360, Toshiba HD-DVD (yes … I still have one).
Subwoofer (current): Elemental Designs A3-350. Original eD driver replaced with Infinity Reference 1260 12” 4 ohm single voice coil driver (nice sound improvement). Powered with 300 watt class D amp. Enclosure is ugly – but nicely built and braced. If you need a reminder on the specs see here: 18" W x 20" H x 20" D – port is 4” diameter.
I am 40% TV, gaming and sports (think well shot event TV presentations … Game of Thrones, Penny Dreadful, Boardwalk Empire, Hannibal, etc.); 40% Blu Ray and HD DVD movies and concerts; and 20% music (mostly classic rock on high quality downloads, SACD and CD).
I have found after calibrating the system, using the current equipment, that most of my TV watching is at -20 to -15 db on the Onkyo’s volume knob. For movies -15db to -12db seems like it is plenty loud. Music -20 to -17 again seems plenty loud. Summary – I don’t listen at anywhere near reference levels for anything but a “hey check this out” demo of the system. NOTE: I assume because of the power of the Sherbourn amp and efficiency of the speakers, Audyssey cuts all the channels by between -8 db and -10 db, and also cuts the LFE channel by -11db. I dial up the LFE channel by +4 db to add a bit more bass back into the mix.
I put a premium on tight, quality bass, versus absolute SPL or "chest slap". Although the later is not a bad thing.
Thanks for any help you can provide