C9090
I've received the C9090 a couple of days ago and mounted it today on my JBL 2445J (equipped with new diaphragms some weeks ago). Listening tests only, in my system, which comprises in the bass pseudo-Onken W (with 2x15" Ciare), JBL2490/2392, passive xover.
I use the 2445J as a "tweeter", with Xover around 2kHz and a UHF boost using an autoformer in reverse mode (i.e. for signal increasing and not signal decreasing as is usually the case). Boost is set at +7.5 dB as from 10kHz or so. Usual horn (for comparison) is the JBL 2382A.
Impressions:
++ extremely clean sound, very smooth, not much distorsion on certain frequencies, and good image (as regards smoothness and image I prefer it to the 2392A which spreads too wide in my listening room). For a round horn/waveguide, the big surprise is that I can move everywhere in the room, the tonal balance doesn't change much. Fusion with the large midrange horn (90x50°) is good too, no feeling of a hole or of something wrong in between.
- - HF extension is is not as good as the 2382A, which is something I expected given the wide and fast opening of the C9090.
Note: the horn comes without mounting holes (not even to attach the compression driver), but all places are pre-marked for drilling. Since the horn seems to be made of some kind of aluminium sand agglomerated or cooked together in a mold, it is not too difficult to drill the holes (alu is not a hard metal anyway).