My Rythmik D15SE box can go into the attic.
Because this subwoofer is a keeper.
I can't come up with anything different to say than what has already been said of their subwoofers - deep, clean, tight, articulate, accurate, powerful bass.
Okay, so here is the setup: Denon AVP-A1, Linkwitz Orion, Rythmik D15SE
Denon: Speakers set to Small, Crossover Set to FIXED-THX, Subwoofer set to 2SP MIX (SW1 goes to Left Input of D15SE, SW2 goes to Right Input), Sub Mode LFE-THX, THX Audio Setup --> THX Ultra2 Subwoofer On, BGC Off, Stereo Mode (since Direct modes will not allow 2.1), Left & Right speakers @ 75dBC & Sub @ 78dBC.
Rythmik: Limiter Off, Crossover to 120Hz (to bypass), Volume 50% max, Rumble Filter On, Bass Extension 28Hz, Damping High; subwoofer placement is behind the VTI audio rack behind the Denon AVR-5308. Yeah, yeah, I crawled around the room on the floor like a dog while no one was watching and listened for that subwoofer sweet spot.

I think the Linkwitz Orion has super crystal clear and accurate midrange and treble, and the imaging and soundstage is second to none. The bass is excellent, meaning it is tight and accurate (Q= 0.5), and it will shake the walls.
But the one thing the Orion cannot do is shake your bones, rattle your teeth , and produce earthquake level bass with a Q of 0.5.
This is where the D15SE comes in.
Every song I listened to was just amazing - even songs with mainly vocals and acoustic guitars sounded so awesome. Where did those bass come from?
In conclusion, I will now only listen to the Orions in 2.1.
