Martin Poulin
Below is a DATS measurement of the B&C DE35 tweeter
The manufacturer applies a big scale chart to hide impedances anomaly.
However, measurements actually appear consistent with the published datasheet.
Below is a DATS measurement of the Transducer Lab N26MG-G tweeter with a magnesium dome.
The manufacturer’s datasheet matches the measurement within 5%!
I like this brand very much, as I own a few of their products.
Below is a Celestion CDX1-1445 mounted on a FaitalPRO STH-100 horn
Below is a Beyma CP22 tweeter
Below is a Transducer lab N26C-t, ceramic dome and Titanium voice coil) with a diy front horn attached in front
Below is a Transducer lab N28BER, beryllium dome, with a diy front horn attached
Below is a newly acquired BEYMA CP21 (brand new)
On the left is an overlay of the Beyma CP21 and CP22
Makes comparison easier.
Identical motors and diaphragms.
CP22= bullet front horn has a narrow 40° wide dispersion
CP21= 140°degree wide dispersion, inspired by the JBL 2405 slot tweeter.
The CP21 has lots of horn resonance, as seen by the impedance curve. This doesn't bode well, but wide dispersion tweeters do offer big acoustic advantages. Some trade-off to consider.
Subjective evaluation will dictate which design matches my system best.
Nothing better than actually trying both out, instead of deciding through reading countless reviews. Review tend to favor the CP21.
(update Mach 2020, I prefer the CP22.)