Recording Studio Mixing / Mastering - Best Sub Choice?

[auramatrix]

I have narrowed it down to 3 subwoofers and would love everyone's advice. Arendal 1723 1S, SVS SB-3000, or HSU ULS-15 MK2. I am also open to other suggestions. I will be buying a pair of whichever I decide to go with. The application is for mixing and mastering music, so accuracy is #1. Room size is 20'x12'x8'. I appreciate any help you can provide.

 

[Ricardus]

The data I've seen suggests 1 sub for a room that size is preferred. Otherwise you will have comb-filtering (constructive and destructive wave interference problems) with the low end.