Form factor and functionality is main motivator for single box speakers so anything goes, they are lots of fun for what they are even if the stereo field wasn't optimal 🙂
Those who would like to go all in can and should build big enough system that can control directivity to low enough frequency to reach what ever goal, perhaps then two or more big boxes are tolerated and expected anyway 🙂 completely different motivation / application.
Nice!
The open dipole one could possibly benefit from a bit more of a baffle to help front/back (or left/right in this case) separation. Not only for the sake of reducing low frequency cancellation, but also to improve the stereo separation a tad.
For anyone who has some moderately advanced recording software (DAW), it's easy to convert regular stereo to 2-channel mid/side.
Just duplicate both left and right channels, and pan each pair left and right. You now have mono in both speakers. Then just invert the phase on one channel in one pair, which gives you Left-Right on that side. Render to a stereo (well, not technically stereo but 2-channel) WAV, and use for experimentation.
I suppose you can also do it in real time, by feeding the DAW a stereo music source and listening to the DAW output. Or if you have an analog mixer with phase invert on the channel strip, you can of course use that!
I think I was a bit confused, since we are talking about two very different approaches at the same time. I think that perhaps the thoughts about directive was primary meant for the OB matrix approach?
In fact, I think that by using your curved front reflector should reduce issues of directivity narrowing in the higher frequencies. The curved surface always "sees" the sound at an ideal straight-on angle, and then spreads it evenly. This, I feel, might make it a good candidate of larger full range drivers, that otherwise might suffer from beaming.
I do agree that an Aura Whisper should be pretty happy at 250Hz and up, at fairly high sound levels.
I'm wondering what the difference might be if instead of a large convert reflector, you use a pair of concave ones?
@danb11 I've read your thread thanks to @pelanj who pointed me here when I asked if anybody ever replicated the JBL Paragon with fullrange speakers.
It's not planned to be built at the moment, but I would like to collect some information in case I'll decide to build it in future.
What I'm imaging is a 3 meter long single cabinet with a curved surface in the middle and the speakers pointing towards it, one from each side.
The central part of the cabinet could be dedicated to the sub if needed or, if openable, to contain the amp or, if stiff enough, liquors.
Have you checked the impact of the angle of attack of the speaker to the curved surface, and the radius as well?
Thanks!
It's not planned to be built at the moment, but I would like to collect some information in case I'll decide to build it in future.
What I'm imaging is a 3 meter long single cabinet with a curved surface in the middle and the speakers pointing towards it, one from each side.
The central part of the cabinet could be dedicated to the sub if needed or, if openable, to contain the amp or, if stiff enough, liquors.
Have you checked the impact of the angle of attack of the speaker to the curved surface, and the radius as well?
Thanks!
Thanks @tonyEE , the Paragon was indeed the incipit of my post, but the Paragon is a two way speaker cabinet.
I'm talking to something with fullrange speakers like this (but possibly nicer):
No, I haven't completed the build yet as life and other projects have been getting in the way. The influence was actually the JBL Minigon with the tweeters (or extended range in my version) facing 90degrees in to the arc. I've reduced the size down to a boombox kind of form as even if the experiment is not entirely successful, my daughter will enjoy the result in her room.
From my non-science-y logic it needs to be an arc of the circumference of a circle, the opposing drivers shouldn't be able to see each other and the baffle needs to be large enough to avoid too much diffraction to the sides. So, the radius is dependent on those factors. It can quickly get huge.
I'm looking at cheap 1" wideband drivers at the minute to get the baffle proportions a bit better. XO 500hz ish to a cheap mono mid/bass. Will upgrade if it satisfies.
My 1st experiment gave me enough hope that there is something there.
I would suggest you try an experiment with sone wet 3mm ply bent and braced until dry.
I will report back eventually!