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Originally Posted by
Denon2807 
Should I be pairing two different brand subs together to begin with? Are there negatives to doing that?
It depends whether the frequency responses of the subs are similar or not. You can pair two different brand subs with similar/identical frequency responses, but ones with different responses shouldn't be paired up. That will cause some phase and frequency response issues. Naturally the HSU MBM-12 can be paired up with almost any kind of "full range" subwoofer, assuming correct filtering will be used.
SVS PB12-ISD/2 and HSU HO can not be succesfully paired up. You should go with two subs of each.
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What do you guys think I should go with? I'm ready to buy either setup that you guys feel would give me the most bass for my large room. I'm leaning towards one of the PB12-Plus configurations though as that way I could have at least one of the two subs that look stunning, even if the HSU isn't all that ugly in person.
I wouldn't call HSU subs ugly in person, though SVS cabinets are prettier. Unless you are a desing freak, I think you are happy with either one.
I don't know you typical listening levels, but your room size suggest at least two subwoofers (+6 dB over single when co-located). With $2000 budget I would go with two HSU VTF-3 MK3 and the Velodyne SMS-1, but that's just me.

I can go into more detail why I would choose that if you PM me.