This thread has ruined me, but maybe in a good way? I have gathered/set aside so much equipment and made many, many more plans because of all the information shared here about these speakers.
I’ll never be able to afford purchasing 4722s outright, so I’ve come up with the closest approximation I can muster by acquiring bits and pieces over a longer timetable. I got lucky and picked up a gaggle of empty horn cabinets with no drivers back in August of 2017 and it has taken until very recently to piece together one working pair of speakers.
Here’s a glimpse of some of what I’ve been able to assemble:
This is ⅓ of what will be my eventual front stage. For HF we’ve got the 2384 waveguide/2432H compression drivers. I bought the horn lenses new and the used CDs came from eBay. The horn loaded midbass cab is a JBL 4560 (was a 4672A cinema cab in a past life) with a single 15” 2225H woofer. The low stuff is handled by a BFM Table Tuba folded horn subwoofer which I recently completed. This basic configuration will be my center channel, just with the 4560 sitting on top of the TT (which will be laid on its side). The L&R will be the same basic configuration, but each paired with a BFM Tuba HT instead.
I busied myself for a while by constructing basically the LF section of a JBL 3110A passive crossover and the HF section of the 4722N passive crossover before scoring a really good deal on an active crossover solution. It is so fun (to me, though other people’s eyes glaze over when I describe it) to be able to dial in exact delays and crossover points for each individual driver now that I’ve gone active with tri-amplification. Each driver/enclosure is able to work in the range that best optimizes the horn loading, which I find insanely cool. After going active I had to read back through this thread and others to figure out that I needed an L-pad (or autoformer) to attenuate the HF horn. I wound up ordering high wattage resistors and building L-pads that attenuate 12 dB to match the sensitivity of the midbass cabs.
As this future front stage stands right now, I’ve got three of the waveguide/compression driver combos, two of the midbass cabs with drivers, and the one TT. Once I build a third midbass cab and construct the Tuba HT enclosures (I already own the drivers) I’ll be that much closer to my goal of all horns, all the time. All I need is more time, more money, and a room to put this trio of behemoths in. I can hardly get far enough away from these things to listen properly in the current bedroom I’m storing them in.