what type of subwoofer is good for ribbons

Duke (Audiokinesis) is too honorable to blow his own horn. However, nothing prevents me from doing it for him. His SWARM system is outstanding, if:

1) it's in your price range
2) you have the space to place 4 small-footprint subs
3) you can deal with the cabling for #2

I own his Planetarium Betas, of which the SWARM is an integral part. If, however, I were an owner of Maggies, Quads, or the notoriously bassy-shy M-L 'stat, I'd be all over these.

> all the placement recommendations mentioned in the multisub paper on the Harman web site were very symmetrical not asymmetrical. Whether 2 subs or 4 subs, they are always in the same position on opposing walls.

The idea behind asymmetrical placement is to minimize standing waves by decreasing constructive interference i.e. each sub has a different interaction with its respective room boundary or boundaries, which smooths the overall response.

I have placed my four SWARM subs in many, many different locations, including a symmetrical setup. Trust me, you do not want to do this.