Dual Subwoofers?

If you’re running amp to sub to bookshelf and high passing the bookshelf speakers then it seems to be essentially using a sub for each channel and if you’re running subs that high (80+) I’d situate them very close to the speakers to get ’full-range’ speakers.

Otherwise, if not high-passing the mains, I might consider two asymmetric locations for the two subs (not necessarily by them) for better low bass integration in the room and low pass them lower than normal. Depends on the small speakers I’d say.

I moved from an REL B1 to three active SVS subs and added another sub recently for four total, set up asymetrically in my main room. It works superbly for really low end bass, and stays out of the way when not needed.  I'm a +1 on D.B.A. setups.

Even if the two subs are at the corners close to the walls?

@portoalegre wrote:

[Are two subs better] "even if the two subs are at the corners close to the walls?"

Yes but the improvement is not as much as if the two subs are in acoustically very different locations... like one in a corner and the other along one of the walls opposite that corner.

The basic idea behind a distributed multi-sub system is this: You want each sub interacting with the room as differently from the others as is reasonably feasible, so you want them to be in locations that are acoustically dissimilar. This way each sub produces a significantly different room-interaction peak-and-dip pattern, and the SUM of these multiple dissimilar peak-and-dip patterns is smoother than any one alone, and this improved smoothness extends throughout the room. And, perceptually, "smooth" bass is "fast" bass because it is the in-room peaks which take longer to decay into inaudibility.

If you have no other option than to place your two subs in the corners, here are two things you might try: If they have adjustable phase, set their phase controls 90 degrees apart. And if you can get away with it, elevate one of the subs so that it is closer to the ceiling than to the floor.

Disclaimer: I have been commercially involved with distributed multi-sub systems for many years.

Duke

What ever direction you go, be patient with the implementation—and reconsider where your mains reside. It will take time to nail the placement of the sub(s) and integrate them properly. But you will get there and it will be worth it.

Finally +1 to the other comments on Swarm/DBA. It’s the ultimate and you’re not giving your money to big brands and you will accomplish way, way more.

2 subs much better than one.  A couple SVS SB1000 Pro subs will get you down to an honest 20Hz with minimal size at less than $1000 and absolutely transform your listening experience.  

@mikeydee , Above mentioned or the SB2000 Pro would be the most affordable solutions if you have never heard dual subs set up correctly before...and looking to get your feet wet.

Price goes up from there...

Here are some very good subs ... 

Rythmik F12 (12 inch), F12G (12 inch), G22 (dual opposed 12 inch) 

KEF KC62 (dual opposed 6.5 inch , KEF KC92 (dual opposed 9 inch)

Elac Varro DS-1000bg (dual opposed 10 inch), DS-1200bg (dual opposed 12 inch)