On 07/08/2014 12:20 AM, Gregorio García Karman wrote:
How about using loudspeakers with cardioid characteristic in the bass range? http://www.me-geithain.de/index.php/en/studio/products/active-loudspeaker/rl901k
I've used that speaker a couple of times, and it's fantastic. I sure would like to build a third-order periphonic rig with those, but for the tiny little obstacle that is the (entirely justified) price tag Joachim Kiesler puts on those.
It's a good addition/correction to what I said before about directivity vs. radiating area - you can of course also obtain directivity by "wasting" some energy to the rear to actively cancel unwanted sound, and that is a bit easier to do for very low frequencies.
Taken to the extreme, you end up with dipole basses, as discussed by, among others, Siegfried Linkwitz. If you have some flexibility as to speaker positioning, they must be very nice indeed.
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