Petter Persson - Listen to a planar speaker (i.e. Magnepan). Planars don't have the problem of omnidirectional lows and forward-firing highs. They give the impression of listening to real sounds rather than speakers.
A long time ago, some conventional speakers had both front and rear firing tweeters. I suspect that not enough listeners cared about being omnidirectional to keep the rear-firing tweeter from being cost-optimized out.
Ed
Yes, they do have a sound thar differ from the conventional. I'll investigate that further. Thanks.
The rear firing tweeter will even out the energi. Adding a mid-woofer also, crossed at the baffle step frequency would be ideal. Summation (front/rear) might be an issue...
You broke your own rule there 😉 Since you mention it a smooth DI through a crossover doesn't require the use of a MEH.I guess the only way to isolate radiation pattern effects is to build sets of large enough MEH similar to what mark100 and A for Ara have done...
Haha, I'm good at that... ;-)
That's correct if only the horizontal dispersion is of intrest, or am I missing someting? How could the verical dispersion have a smooth DI if more than one source of sound is involved? (digital brick-wall filters excluded...)
That's correct if only the horizontal dispersion is of intrest, or am I missing someting? How could the verical dispersion have a smooth DI if more than one source of sound is involved? (digital brick-wall filters excluded...)
There's a complex interplay of the direct sound, the power and the nature of the reflections that exist. It can be done. For that matter you can have a not smooth DI from a MEH, and you can have HOMs. MEH polars often show waistbanding etc.
in a treated environment, i think generally, it wont matter
so the worst your room is, the more constant directivity would be obviously a advantage
so the worst your room is, the more constant directivity would be obviously a advantage
The results are intresting, but I would not go further to claim the constant directivity horn for the battle loss. I see it as the speaker as a whole was outperformed by the Revel.
I guess the only way to isolate radiation pattern effects is to build sets of large enough MEH similar to what mark100 and A for Ara have done...
If the speakers have drivers of adequate size and quality for nonlinear distortion and resonance to be at a low to inaudible level at standard listening levels then the factor contributing to the character of the sound heard is the radiation pattern and how it interacts with the room. Making appeals to vague unnamed factors may be the standard audiophile approach to help justify wanting to play with electrostatic speakers, ribbon tweeters, MEH(?), etc... but it doesn't help engineer speakers or stand up to much examination.
Unless a person sits close to a constant directivity speaker when listening in most rooms in a home a tonal balance skewed to the high frequencies will be perceived. This not only follows from the physics of sound in rooms but is also supported by listening tests over the decades. The reason for their use in studios is partly because the acoustics of studio rooms is different to the home and partly because what is wanted from the sound is different most of the time.
Thanks for the input everyone. A pretty straight-lined DI starting as low as possible (around the Schröder frequency) and reaching some 7-8 dB at the top end would be a intresting project!
Like this? Slightly wider dispersion waveguide and you are there. The extended soundstage („size“) of this solution has already been noted.
I found the „lodge“-effect that TNT has noted the most disturbing for CD designs and the single source of my disappointment with this speaker topology. And while I agree with wesayso, that a very wide pattern introduces its own problems, I was still amazed when I listened to a 140 degrees horizontal pattern speaker. It was not good, but 90 are not either in my experience, at least when no cardioid low end.
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^(early) Reflections succesfully reduced 🙂 Finding balance is a task.
If you have another set of speakers at hand and capability to add delay to them I suggest try it, adding another set behind you delayed as "late reflections" territory adds envelopment which is quite nice. Still get accurate sound in front of you and be surrounded by it as well, out in the concert hall. Still distance to speakers and their position is important to get correct "width".
If you have another set of speakers at hand and capability to add delay to them I suggest try it, adding another set behind you delayed as "late reflections" territory adds envelopment which is quite nice. Still get accurate sound in front of you and be surrounded by it as well, out in the concert hall. Still distance to speakers and their position is important to get correct "width".
A pretty straight-lined DI starting as low as possible (around the Schröder frequency) and reaching some 7-8 dB at the top end would be a intresting project!
GGNTKT M1, a commercially available loudspeaker that should further lead into this direction, tested from before when Anselm Goertz had picked up ANSI/CTA-2034-A style data presentation with S&R. This is why nothing to say about dB SPDI. But the sonogram indicates a lower than usual level here:

From: https://www.soundandrecording.de/equipment/ggntkt-m1s-2½-wege-monitor-im-test/
Perfect!🙂The limitations of stereo are not a deal breaker. I would not compromise it with more spaciousness.
Without reflections, the room is no longer a limitation and the soundstage reaches as far as it wants beyond the room.
The D&D already has been mentioned, let's add the Kii Three.GGNTKT M1, a commercially available loudspeaker that should further lead into this direction, tested from before when Anselm Goertz had picked up ANSI/CTA-2034-A style data presentation with S&R. This is why nothing to say about dB SPDI. But the sonogram indicates a lower than usual level here:
View attachment 1129135
From: https://www.soundandrecording.de/equipment/ggntkt-m1s-2½-wege-monitor-im-test/
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