Two subwoofers in smallish HT room?

Thanks for all the input! Looks like I will have to invest in a second sub for my room. More than two subs in the room isn't feasible purely from a space standpoint, unfortunately.

I'm quite curious as to why the there is a strong recommendation for two identical subs though. I guess I was kind of hoping I could get away with a smaller, less expensive sub as the second sub - a matching sub wouldn't be outrageously expensive, but it isn't cheap either, and these subs are LARGE. What would be the major disadvantages of non-identical subs?

Hi Soundprogression - thanks for the note. This particular Vandersteen subwoofer (V2W) is made specifically for HT applications. It does not have an external crossover like the Vandersteen 2Wq subs most audiophiles are familiar with. It's a line-level input only sub, and uses the processor's crossover, so in that respect it is just like any other HT sub on the market. My processor has two identical LFE outs, so adding a second line-level sub is a piece of cake from that standpoint.

My local dealer suggested I try the route you put forward in your first paragraph. I have been pleased with the bass of the Vandersteen, but not with its output. He thinks I ought to try a single Velodyne DD15 in the room before considering adding a second Vandersteen HT sub (or dual subs from other brands). He says the combination of higher output capability and the EQ functions of the Velodyne would probably make it an easy fit. It would also not create additional space constraints.

The only problem is that adding a second Vandersteen would cost approx $1300, whereas the Velodyne lists for like $4000. :-( I'd be able to sell my existing Vandersteen very quickly, but the Velodyne is still a big chunk of change.