Most accurate sub under 1,500 used


I have been looking at velodyne digital drive series and REL. The room is 12w X 23L X8H. 60% movies and 40% music usage. I am open to other recommendations as well.

Thanks
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How much will I gain over the DD12 with the DD15

A lot. If you went with a DD12 you might want two while a DD 15 or DD 18 would probably be enough.
I have a DD-12 in 15 x 20 room with 10 ft ceiling. The volume is set to ~20 comfortably, and I have never maxed out on the volume or bottomed the woofer. You should still get the largest that you could afford, but if it comes to DD-12, I think it could work just fine in your room.
Shadorne, are you talking about more low frequency extension or sheer output?

Output at low distortion. Bigger is better. FWIW - the SVS PB13 is exceptional at low distortion at ultra low frequencies due to the ported design (great for movies), however, I think you'll find you want to plug those ports for music - and the DD-15 will give your more musical bass drum slam output between 40 and 80 Hz...