Bass reinforcement for very large room

The reason dipoles do not excite as many room nodes are the nulls to the sides. Directly to the sides, the waves fully cancel and there is no output. (Yes, I've had dipoles along with everything else.)

Kijanki, I think the 938 is a very good all-around speaker. Superb, actually.

Your idea of rotating the cabs would probably not work all that well since all cabinet bass is largely non-direction under, say, 60 Hz or so. Also, the speakers are each more than 3' from the side walls already (but I have them very near the front wall for bass reinforcement).

Paulfolbrecht

I did read carefully. Your problem is two fold. First your speakers should be able to fill the room. If they are not like you claim the problem my be not enough power and headroom to fill the room adequately. Have you listened to these speakers in a smaller room and achieve a different result with the same equipment?

You seem to want to hear people tell you about multi sub applications more than what the underlying problem may be. I'm in full agreement with the multi sub concept for your application but that may bring a whole new set of issues.

Multi sub applications become very placement sensitive and you will need to experiment. Be flexible when trying to achieve bass that will be time aligned to your main speakers.

Just putting two subs near the back wall next to your main system may or may not cut it and could also cause a cross cancellation between the two subs and/or your speakers.

I you're having some issue with your speakers and room interaction I personally would spend more time with speaker placement and room inter-action to achieve the best possible sound from your Hyperion 938s before spending a lot of money only to find out you may still have the same issues now only compounded more.

You may also find out the Hyperion 938s are just not going to interact well with your room

I'll be totally honest a previous poster mentioned horns for such a large room and he is really not off base at all. Horns become very easy to place in a large room like yours and you will get room filling sound like no other type of speaker. (I'm not an owner of horn speakers) It really sounds like you may be limited on speaker placement WAF issues and the like. If thats the case you may be fighting a loosing battle in such a large space

Good luck I would be interested in what direction you go and the results.

Ed

Classic Audio Reproductions T1 or T3 will do the trick.

Apachef1, it seems you failed to note that I am not interested in pushing those drivers to the limits of their excursion, causing distortion. The realization that I have come to is that even a three-way floorstander is not capable of truly pressurizing a space of this size. Adding "more power" is not part of a solution to the problem I presented both for the reason of driver excursion *and because I'm not desiring higher SPLs*. I never said the music is not loud enough at the listening seat - it most certainly is.

Cancellation between subs and speakers is obviously something that has to be dealt with in setup.

I'm not interested in changing the sound of main speakers, which in general I like, especially by a move as radical as going to horns. I'm confident that's not necessary.

Adding a pair of large subs isn't going to really pressurize this space as happens in a small room either, but it's bound to be an improvement. I'm pretty confident that quality stereo subs carefully setup and crossed high enough to fill in even the 40-80 Hz area is worth a good try.

Tvad, it is very generous to offer me a pair of the excellent Classic Audio horns. I would prefer the T1 but will not complain about either. If I did go to front horns it would be those speakers, or possibly one of John K's custom offerings. Or - if you were really going to splurge - the Cogent field-coil horns, which are the best speakers I've ever heard.

They still needs lotsa help below 60 Hz tho.