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Constant Beamwidth Transducer (CBT) Speakers
- Thread starter RickS
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- #322
Yes, but for home theater would prefer darker. Perhaps baffle in black and the cabinet in walnut?
Had glossy black with maple veneer as a second option. But either all black painted or combined with walnut is also something to consider. Offering two standard ones is likely enough, but hopefully with the option of custom finishes with pre-ordering.
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Cool stuff! Where in Norway are you located? I'm in the Oslo area and would love to hear a pair of these some day! Not that I'd ever be able to afford it though, but still
25 minutes drive from Bergen down town.Cool stuff! Where in Norway are you located? I'm in the Oslo area and would love to hear a pair of these some day! Not that I'd ever be able to afford it though, but still
May bring the CBTs to the show in Asker in March. But obviously a small hotel room isn't the best for demoing.
OSLO HIFI SHOW | Oslo HiFi Show
www.oslohifishow.no
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Ah yeah Bergen is a bit too far away, but a hotelroom in Asker might work! The CBT should take the room a bit out of the equation thought shouldn't it?25 minutes drive from Bergen down town.
May bring the CBTs to the show in Asker in March. But obviously a small hotel room isn't the best for demoing.
OSLO HIFI SHOW | Oslo HiFi Show
It greatly minimizes vertical reflections. There are hardly any audible ones. Horizontally the dispersion is wide. While it's constant/uniform in the horizontal plane, it will obviously cause early arriving reflections. We will treat those though, but treating for many seats is tricky.
But we may only bring the Vera Audio Coherence 12 speaker. Not sure it's a good idea to bring both.
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Yeah you only have to deal with half of the reflections which is nice. And as far as I've understood they also have a wider sweet spot as well?
Personally I'd vote for you to bring these, will probably attract a bigger crowd, they're really interesting speakers imo!
Yes, sound doesn't change much anywhere above the Schroeder frequency due to the constant directivity and less than 3 dB loss per meter. But a larger room would have been much better. Might bring both.
Yeah, it seems to me the center channel would run hot...
(As you can see, that was acceptable for a spring/summer review but not a viable permanent solution.)
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I am curious about which direction represents the apparent source direction for the CBT speaker.
When you consider that there is an acoustic 'mirror image' of this speaker below the floor level, it seems to me that the apparent midpoint/source is where the speaker touches the floor.
Surely the speaker doesn't sound like the sound is firing up at the listener from the floor level?
And, if the apparent source is not where the speaker touches the floor, why is it not so, and what is the true apparent source height?
When you consider that there is an acoustic 'mirror image' of this speaker below the floor level, it seems to me that the apparent midpoint/source is where the speaker touches the floor.
Surely the speaker doesn't sound like the sound is firing up at the listener from the floor level?
And, if the apparent source is not where the speaker touches the floor, why is it not so, and what is the true apparent source height?
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Wow that is very interesting... I was thinking of the front surface of the speaker, not the centre of curvature.
So, if the speakers were ceiling mounted, a seated listener might hear the apparent source near to the lowest-hanging point of the speaker! Even though very little audio output is coming from that section of the speaker!
cheers
the tweeters look like these:
https://www.parts-express.com/pedocs/specs/285-103-dayton-audio-ce32a-4-specifications-2940.pdf
https://www.parts-express.com/pedocs/specs/285-103-dayton-audio-ce32a-4-specifications-2940.pdf
Looks can be deceiving
We don't use any Dayton drivers.
Those are midranges. Not that I doubt you saw them used that way.
Also only good for about 82dB SPL each. Best used in a tuned box as a cheap computer speaker.Yeah, they say '20k'. That's true if you consider 65dB SPL at 20k useful.
If each doubling adds 3db, and you have what, 20 of them?Those are midranges. Not that I doubt you saw them used that way.
Yeah, they say '20k'. That's true if you consider 65dB SPL at 20k useful.
Well, while it does increase the maximum output, do you really want the maximum output being the "minimum necessary output"?
There are way, way better choices, and they don't cost a whole lot more, either. Considering, assuming power addition (I doubt these are close enough to sum precisely at 10kHz, let alone 20, given their diameter), 16 of them gets you 12dB more, or about 77 dB.
I generally try to avoid the "mean required output" of something to also be the "maximum possible output". It only leads to trouble, and, oh, wait, wrong context, smoke.