Here they are, as they appeared at AKFest 2010. They sounded great and I think they looked pretty nice too. They aren't quite done yet.. feet yet to come.
In my 2445 core (5 slit metal core) I have tried NOS D16R2445 (original Ti diaph), NOS D16R2441 (aluminium), Non-JBL Be diaphs, and some aftermarket stuff (ribbed Ti). The non-JBL Be had indeed extremely smooth sound (great on classical music, opera, violin etc) and more HF extension in the area 8-12kHz but then dropped dramatically in a way which I did not manage to compensate with a passive crossover using HF boost circuitry. Aftermarket ribbed Ti diaphs gave a similar sound (no joke). 2441 Al diaphs were very smooth indeed, but lacked UHF extension and impact in the 2445 core with my horns.
For the time being, I've decided to stay with the NOS 2445 Ti diaphs due to their UHF extension capabilities with the UHF boost circuit, general sound impact and resolution etc. , and tried to get the best and most out of them with appropriate horn and equalising. I'm still working on it: Russian NOS capacitors in the mid and the HF/UHF crossover paths give a harmonically rich and milder yet very resolved sound (I discovered that the 2445 shows the limits of classical MKP caps) , adjusting cap/coil values and boost level carefully, adding a serial 30 ohm cap etc. have helped a lot smoothing reasonably the 2445 diaph, without loosing attack and the "bite" of this diaph which is so extraordinary on pop rock, jazz and good recordings generally etc.
2445 Ti diaphs do not forgive bad recordings, any saturation in the mikes and recording preamps etc...This is noticeable on good recordings made for instance in natural ambiance with mikes run at high power supply levels with tube preamps. The Ti diaphs can be a pain in the neck but also a fantastic magnifying glass of recording defects... In contrast, the Be and aftermarket ribbed Ti diaphs allow you to forget about the system on most recordings and classical music but still...Tweeter is needed and something is missing in terms of impact to my taste.
These are very nice horns/waveguides and in my experience up to now, an excellent geometry for home-FI use on a 2" driver. I had, similarly, a pair of 2" entry JBL-inspired "butt-cheeks" horn custom-made by someone, which give so far the best compromise in terms of openness, presence, equalising possibilities, UHF extension etc. . At least in comparison for instance with JBL 2350 which is definitely a long throw PA horn (but I intend to test these with extra vertical lips some day as recommended by JBL), 2382a which is a great design but has too broad coverage in my home and gives a lesser sensation of immediacy to the sound etc.
I have got almost the same conclusion with the measurements
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