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DE250 is the benchmark for 1" compression drivers. Lower priced alternatives are the Selenium D220ti and PRV D280ti, both of which I slightly prefer.

You could just cut all the waste away in five minutes with a bandsaw instead of (very) slowly turning all of that extra wood into sawdust on the CNC; probably save you a few days at least....

very deep and well done review of this driver. I looked in your blog and found a zoom-in plot of the impedance, a small peak at about 9kHz and a (to me) corresponding one at presumemably exactly half the frequency at about 4.5 kHz - may be a resonance caused by a reflection from the horn mouth back into the compession chamber stopped at the diaphragm (kind of standing wave?). Can be seen in the burst decay as well. The difference in the samples preproduction vs no. 2 might be alike, a resonace between the diaphagm and the pole for example ... ideas .. here well damped vs not damped as good ..

I suspect having something shipped to Australia would be ridiculously expensive.

please test the 5530ND

Horn is much more dynamic, but also has much less output to the sides, so narrower listening position. Open baffle horn could provide the best of both worlds.

such great products. They certainly deserve to be presented in audio/hifi trade shows!

Very nice! I am thinking of not continuing with Rhinocam. It's getting very pricey. What are you using for post?

I didn't realize they took that long to make, they look beautiful.

It could be their phase plug ringing. And slightly different material makes the dip smaller.

I am so happy you posted this video, Troy! I have been considering using the DH350 for the 2kHz ES Circular Horns.

Nice review

Thanks Joseph.. I hope you could do a review on the B&C DE550TN..

Very nice assessment. I appreciate the thought process of the "grossly mis-aligned" driver sanity check. Solid work, cool stuff.

Thanks for sharing! I remember from other c. drivers that un-/remounting the rear cover sometimes led to a distorted sound (detected that with REW THD measurement). Now from your observations I wonder if it should be standard practice to always micro-adjust (optimize?) comp. drivers by running a THD measurment while assembling a driver and tightening screws...

Lovely stuff there Joseph! Xx

I expected lower fs for a 34mm hard dome. So I will wait for the purify tweeter test.Great job Joseph!

where can I get a pair of those Bliesma T34B?

Interesting. That Be driver looks good. Have you tested the Truextent Be diaphragms on your horns? I’d like to know how they compare to the Be dome tweeter

Nice compairson of the Beryllium and Ceramic. It does re enforce my experance that most Ceramics I have tried sound harsh. I have only used cheep ones so perhaps this one is better. I have been looking for a cheep Beryllium and their has been on ebay for a few years that is 16% Beryllium and the rest Copper. No reviews anywhere. Its under the name davidlous and they have a 25mm unit. It does look like the primary breakup is about 14K which would make it about the same as a ceramic. Perhaps the damping is a lot better. Love your work BTW.

Thank you very much for making this video

i wish you would have compared them to the ns1000's!! imo those are some of the best speakers ever made!! i have yet to hear a pair i liked more

How would you compare it to the hypex plate amps

Troy like you make speakers how about making amps and player with airplay too nice looking units

Does the textreme version better than beryllium version?

just looks awesome due to the wideness. like a lowered car looks more awesome than a regular car. So if cost-no-object, clearly the way to go. btw, what's the maximum crossover frequency to avoid comb filtering off-axis?

I use the 5.3 in a small TL. I get really impressive output, but I don’t listen loud. The enclosure is the woden audio bloodhound baby lab.

I found a pair of these multicell 805s in 1976 and immediately realized why they were so affordable. They were nasty sounding. I eventually located a pair of JBL horns and lenses, 2397 if I recall, to replace them. It was a different world of sound, even working well indoors for a high level rehearsal system. The full size JBL lens had superb pattern control.

BMS 5530ND please test this driver would really be happy to hear your opinion

Very interesting, I wonder if trimming back the dividers in the mouth of the horn just a little bit would help merge the exciting signal so that there was less combing effect.

How does your multicell horn design compare in the offaxis polar/directivity map? I don't like that combing effect...

I always wondered how these measured, thanks 😀 The distortion figures are quite good at the typical SPL levels we normally use in home audio. I wonder how much it was at the typical SPL levels of a concert? Id imagine adiabatic effects start to dominate at some point due to how narrow the throat is compared to the end of the horn. My brother used to use some Altec horns (maybe those from the A7's or something similar) with 2x15" PA drivers back in the day. I don't remember it being a very nice listening experience, just exceptionally loud. Be interesting to actually hear them in a properly configured setup.

Thank you! Always wondered about the interference behavior of multicell horns, and there it is :) Not too bad for such a classic design, and a surprisingly wide disperion angle @ 10k. Now I wonder again, what could be possible in 3D print age, with much smaller, rounded clusters and a more homogenius coupling to the throat.

Very informative.thanks.

Love the content. Thank you

Slightly OT question, Joseph.. Is there a Field-Coil compression driver that quite impressed you (despite of cost?)

This is interesting, thanks!

I whould make the edges that go from the tweeter also exponential/nonlinear.

You have a porn tab still open

I have to be Joseph Crowe’s biggest fan. He’s AMAZING!

The Peavey 44XT is quite a good born driver … 🎉(((

The first one, passive was my favorite. You have an incredible gift. I absolutely love your work. I’m definitely going to reach out to you when I purchase my next system. Thanks for sharing!

Beautiful.

Thanks a million for this detailed review. What do you use for making measurements? Room, microphone, interface, software???

With a crossover frequency @800Hz bringing the woofer emission point to that height is very likely to generate a reflection from the floor (called mirror image floor source) that will cancel frequencies in the range reproduced by the woofer. This is what I learned reading the writings of some respected acoustic designers including the never too much missed eng. Renato Giussani (ESB, Aedon, GR-Research). Better to install this Yamaha for the purpose for which it was designed. (large bookshelf)