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https://www.parts-express.com/GRS-RT1.0-8-Hi-Res-Neo-Ribbon-Tweeter-8-Ohm-272-200?quantity=1
I am curious about this one.
https://www.parts-express.com/Dayton-Audio-AMTHR-4-Hi-Res-Air-Motion-Transformer-4-Ohm-275-096?quantity=1
Fully rectangular, or truncated?
You can see my prelim sweeps in my Hancocks thread. FR is likely not accurate, but HD should be valid against it.
InDIYana Event Website
Wolfy's Photobucket
rectangular
Not fond of that hump in the fr.
The Dayton Audio AMT Tweeter is engineered to deliver high-resolution audio, capable of achieving frequencies up to 40kHz.
That one might impress your dog.
A square is a rectangle, but a rectangle is not a square..
https://www.parts-express.com/Morel-MDT-12-1-1-8-Neodymium-Tweeter-277-060?quantity=1
https://www.parts-express.com/Morel-MDT-39-1-1-8-Compact-Dome-Tweeter-277-035?quantity=1
Don't know if Beston is on your "Good Quality" list.
https://www.parts-express.com/Beston-RT001A-Ribbon-Tweeter-277-110?quantity=1
Is that 94mm max only width or height too?
https://www.parts-express.com/Dayton-Audio-PT2C-8-Planar-Tweeter-275-085?quantity=1
The GRS planar has a faceplate that's 87.5 mm wide
https://parts-express.com/GRS-PT2522C-4-3-1-2-Planar-Tweeter-with-Back-Cup-4-Ohm-272-124?quantity=1
https://parts-express.com/GRS-PT2522-FP-Face-Plate-for-PT2522-and-PT2522C-Planar-Tweeters-272-123?quantity=1
Ron
Here this one doesn’t have quit the hump.😉
https://www.madisoundspeakerstore.com/ribbon-tweeters/raal-70-10d-am-ribbon-tweeter-with-amorphous-core/
Mwaaahaaahaaaahaaaa
On the other end of the spectrum, I have a pair or two of the notorious Walmart ribbon tweeters still on the shelf.
The hump would probably be the best sounding region of these.
JR said he was looking for ribbons in trade for some of his other drivers. Come get 'em!
Sehlin Sound Solutions
Well, not those ribbons lol. You ever do any testing on them? I always wanted a pair but shortly after they went yellow-tagged they were out of stock before I could grab a pair. This was a long time ago, though.
I actually have two pairs. I've never hooked any of them up - but here's some eye-candy (?)
I do need to measure at least one to see what a reasonable companion for them would be.
Sehlin Sound Solutions
They look nice.
Yup, nice!
Muy Bueno, amigos!!
http://bzspeakers.com/ribbon66_en.html
Still in production - can anyone interpret the LMS data into a graph?
http://bzspeakers.com/pd_data/cq_lms.lib
Blue934 - thanks for the very interesting link!
Are you guys seeing this thing? --> http://bzspeakers.com/ddq8_2_en.html?v=20230628
Air Motion Woofer.
Steve, I don't believe those are the same as what Scott has.
Bozhen ribbons and woofers are very unique devices. The ribbons use a real voice coil without a transformer attached to a folded metal diaphragm. The woofers I have not seen used on this side of the pond, but mostly emulate either the old Heil Transar woofer or the Tymphany LAT type structure to use opposed cone masses to isolate and cancel vibration. The main difference is that the Bozhen woofer loads into a horn style manifold.
InDIYana Event Website
Wolfy's Photobucket
Vance tested both the CQ66 and CQ76 tweeters. And the latest is the CQ76B that can supposedly cross as low as 1 KHz.Didn't Rick Craig (RIP) use/sell them?
bzspeakers.com/ribbon76b_en.html
Rick used them often. He informally sold them as he was really the only person in the US that imported them. I purchased 7 pair of the CQ76B last year from Bozhen as a "mini" group buy here at MAC. 4thtry is the only person to use them and bring it to a DIY event that I know of.
94 mm max
The MDT 39 may work.
A square is a degenerate rectangle
Yea, these air motion woofers would make an interesting companion for my pair of CQ76B's. He tested them in a 400 liter box (14 cu.ft). Wonder how they would work in a much smaller box? If the CQ76B's are any indication, they would probably sound pretty good. There is something very special about the sound of these tweeters.
Very cool designs for sure. Would like to see more on the woofers construction.
@a4eaudio
Have you had a chance to measure those BoZhen tweeters? Any data to share?
As you know, the shipping cost pushed me to give up those tweeters, but I was later informed that were available with round faceplates.
Those DDQ devices look interesting. From what I can gather, it looks to be a 2 pairs of push-pull woofers, with an outlet that is rectangular. It's an interesting way of reducing the KMS(x) asymmetries, and reducing both HD2 and HD3, since push pull usually only reduces even order distortion. The downside is those things must weigh a TON, since they contain 4 drivers! per DDQ.
So there's just no way I would get a pair down under...
@tktran , I took tons of CQ76B measurements on an IEC baffle and various test baffles. Since the faceplate is rectangular and 3.75" wide, they fit the OP's guidelines, although I don't think you would want to cross these at 3500Hz or higher, since they appear to be designed for much lower xover points.