Omnidirectional speakers. The future?


I have been interested in hi-fi for about 25 years. I usually get the hankering to buy something if it knocks my socks off. Like most I started with a pair of box speakers. Then I heard a pair of Magnepans and was instantly hooked on planars. The next sock knocker was a pair of Soundlabs. I saved until I could afford a pair of Millenium 2's. Sock knocker number 3 was a pair of Shahinian Diapasons (Omnidirectional radiators utilizing multiple conventional drivers pointed in four directions). These sounded as much like real music as anything I had ever heard.
Duke from Audiokinesis seems to be onto the importance of loudspeaker radiation patterns. I don't see alot of other posts about the subject.
Sock knocker number four was a pair of Quad 988's. But wait, I'm back to planars. Or am I? It seems the Quads emmulate a point source by utilizing time delay in concentric rings in the diaphragms. At low volumes, the Quads might be better than my Shahinians. Unfortunately they lack deep bass and extreme dynamics so the Shahinians are still my # 1 choice. And what about the highly acclaimed (and rightly so) Soundlabs. These planars are actually constructed on a radius.
I agree with Richard Shahinian. Sound waves in nature propagate in a polyradial trajectory from their point of source. So then doesn't it seem logical that a loudspeaker should try to emmulate nature?

holzhauer

Showing 1 response by karls

Interesting thread, sorry I just joined in. Only a few comments, which I'll keep brief.

1. I agree in theory that the fewer room reflections the better, IF one only wants to hear what the microphones heard. However, many people want to hear more than that, and that is their prerogative. Subjectively, if added room reverb makes it sound more 'live' to you, then that's what you should be after. It's still a free country, after all.

2. The closer the listening room is to the size of the recording venue, the more 'real' the reverb is going to sound, because the reverb delay times match. Trying to recreate a full-blown concert hall sound in a den is not going to work, no matter what speakers you're using. Unless you happen to have a den the size of a concert hall, in which case you can use whatever speakers you damn well please.

3. Most people haven't ever studied room acoustics, and think that adding absorption to a room willy-nilly will make it sound 'better'. Not the case, unless you just happen to be very lucky, and often it will make it sound worse. What is really important is to (1) diffuse the reflected waves, and (2) make the in-room decay time the same at all frequencies. A much harder task, and one which requires some actual measurements and math before pasting acoustic foam all over the walls.

4. In typical small rooms, one of the biggest improvements you can make is to kill the first reflections from the side walls, back wall, floor, and ceiling. It isn't nearly as good as a dedicated room, but it's a lot better than nothing at all. Anyone who has done it will agree-- it makes the soundstage open up dramatically and vastly improves the clarity as well. Strong, early reflections are a very bad thing, far more so than diffuse, later ones.

5. As a longtime fan of the Ohms, I would say that IMO, what makes them so special is not necessarily their radiation pattern, but that they approximate the theoretical ideal of a full-range monopole transducer. Their natural spatial coherence and time/phase alignment is likely the main reason they sound so "right", far more so than their radiation pattern.

Best,
Karl