@hbc I consistently see planars and AMTs having higher THD than most domes, even in their advertised useful FR. The RT1C looks awful. I bet you even the cheap Hivi domes measure better than most planars. Only the larger surface AMTs appear to be well enough behaved for use with 2k-ish + xover. I do like the RT2C-A and RT2H-A playing above 3.5k, but you can tell they start straining at higher levels. Optimally I'd cross them over 4k, which is hard due to driver spacing issues.
quick and dirty, pushed into a pillow, mic about 6".
I am quite impressed by the planar for the higher <5K. It has the nice airy quality that I have come to like with my linaeum tweeters. I didn't care to much for the AMT.
I suspect the low frequency rise you saw could be partially due to loading off the small faceplate of the tweeter, and that loading occurs at lower frequencies in the larger tweeters that were tested. But also a small planar driver has almost no 'suspension' travel, so using them that low isn't ideal anyway because THD tends to be high.
My experience with small planars is to use them crossed over very high, and they're really only useful as supertweeters.
My experience with small planars is to use them crossed over very high, and they're really only useful as supertweeters.
This looks like, with the right filter it could make for a very impressive 'super tweeter',Some unscrewing and wire snipping later, probably a HIVI RT1C which I had dropped into some dead-purple-dome holes in Wharfedale Triton a few years ago, which did not really work. Probably need some cross over attention by the looks of this,
perhaps to augment one of those tweeters with awful early roll-off.
Also, the Vifa ring tweeter looks amazing at 'super high frequencies' 🙂
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