I know AMTs are popular, but are you sure this is what you want?
Personally I would only use AMT for an outdoors speaker against rain and wind. Very clinical sound with a hint of plastic.
Without a back chamber you would most likely not be able to cross very low. My TPL-150, without horn and with back cover, was good down to 1800Hz maybe, preferrably 2000Hz. I would guess 2300-2500Hz without the back cover, and it did sounded nicer in the upper most frequencies in open baffle, but not as nice as I am used to with Raal or compression drivers.
Personally I would only use AMT for an outdoors speaker against rain and wind. Very clinical sound with a hint of plastic.
Without a back chamber you would most likely not be able to cross very low. My TPL-150, without horn and with back cover, was good down to 1800Hz maybe, preferrably 2000Hz. I would guess 2300-2500Hz without the back cover, and it did sounded nicer in the upper most frequencies in open baffle, but not as nice as I am used to with Raal or compression drivers.
Thanks for that Rewind, that’s very interesting to hear about the comparison with the TPL 150. I have heard those and know they sound really good. I need a dipole tweeter to cover about 3Khz and up. The GRS PT2522 planar would be a cheap option, but I don’t know how they compare to the more expensive options . . .
A good ribbon would be nice !
A good ribbon would be nice !
From some very crude and unscientific testing many years ago, my vintage pair sounded best to me around 1.8kHz using an LR 24 x-over. I was very pleased with the sound. Around the same time I played around with a pair of coaxial compression drivers and thought they were worst thing I ever heard.
Not a small package! I got two free headphones in the package as a bonus.
Most importantly, have you tried to hold the tweeter with one hand? They work as dumbbell set.
Have sold a pair some weeks ago. For me the impression that ‚treble is in the air‘ is most significant compared to ‚treble is at one point‘.
What other tweeters? AMT? Planars? Ribbons? Domes? Horns?
Opinions do split, no doubt about it.
https://www.diyaudio.com/community/threads/your-take-on-the-ess-heil-amt-reissue-tweeters.413303/
So after more research, the AC AST2560 also seems like it would fit the bill. Anybody selling a pair of those?
Do you guys know of any dipole/open-back AMT (or similar) with 8 ohms impedance? (most of them are 4 ohms)
Most planars come as 8 ohm, and are dipole by design. Not amt though.
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Other than GRS, do you know of any other planar brands that do offer 8 ohms?
Mundorf used to have 8-ohm dipole AMTs in their old models, but not anymore.
Mundorf used to have 8-ohm dipole AMTs in their old models, but not anymore.