Compression drivers?

[Duke]

I definetly believe. And measured it roughly myself. 950 designed just like any standard driver with a dome phragm. Richard Kontrimas himself (as Radian founder\owner) was a pleasure to deal with. Although I was dissatisfied with the professional competence of Radian girl who filled out the shipping documents in 2010 . I don't know anything about the current technical support\owners etc.

Thanks for correcting me, glad to know the 950 has a more conventional exit geometry, more compatible with existing horns.

 

[Tell]

@Tell have you read any of Floyd Toole's books? Thoroughly?

Why do you ask? Are you gonna keep l on dancing around the subject or do you have a point with that question?

 

[Bjorn]

@Tell have you read any of Floyd Toole's books? Thoroughly?

He has never tested a quality horn speaker. Neither proper acoustic treatment, which is another topic. Not to mention the weaknesses with simulatating reflections with a single source, using bandlimited treatment in the study, etc.

I think you emphasize his researchers too much without considering the obvious drawbacks.

Like they say : There's a ditch on both sides of the road. While many audiophiles fall on the side of cable myths and other obvious placebo effects, other fall on the other side thinking researchers are bullet proof and gives all the answers.

 

[Audionaut]

I’ve been playing with this loudspeaker idea for a while > a fully active four-way system based on

the B&C 18HTX100

and the Beyma 18QLEX1600Fe.

What attracts me to the 18HTX100 is its unusual construction. It combines a relatively light 18-inch cone with the B&C DCX464 coaxial compression driver, already integrated with a horn designed specifically for it. In effect, the 18HTX100 is almost a complete three-way system in a single Chassis. The 18-inch cone handles the lower midrange, while the coaxial MF/HF compression section covers the rest through a common horn.

Rather than asking the 18-inch cone to produce deep bass as well, I would prefer to use it only where it should be most comfortable, roughly 100/120 to 600 Hz. Below that, the Beyma 18QLEX1600Fe would take over, as its very strong motor and low-frequency parameters seem much better suited to true bass duty.

The approximate layout would therefore be:

Beyma 18QLEX1600Fe: 25/30–100/120 Hz
B&C 18HTX100 LF: 100/120–600 Hz
DCX464 MF: ~600 Hz–4 kHz
DCX464 HF: above ~4 kHz

The whole system would be fully active and DSP-controlled, so crossover frequencies, levels, delay, phase and EQ could all be optimized from measurements rather than fixed in advance.

Physically, I imagine a fairly tall enclosure with the two 18-inch drivers arranged vertically. The 18HTX100 would need to sit high enough for the integrated horn to be approximately at ear level, while the QLEX could occupy its own bass-reflex chamber below. The result would obviously be large, but not dramatically wider than the 18HTX already requires.

In my opinion, the 464 is a very good compression driver that also measures very well. As for the Triax itself, the only reliable measurements available so far are those from B&C. They’re usually trustworthy, but it wouldn’t hurt to see some independent measurements before making a purchase.

The appeal lies in the division of labor: a massive radiating surface and very little excursion in the upper bass/lower midrange, the integrated DCX464/horn system with controlled directivity above it, and a special 18-inch woofer below it, dedicated exclusively to reproducing the deep bass.

It’s a bit oversized, but I’m definitely tempted to build it.

 

[Flaesh]

based on

the B&C 18HTX100

The horn is a bit too small, etc. https://www.audiosciencereview.com/...entional-vs-coaxial-design.73127/post-2673949
https://www.audiosciencereview.com/...iful-speakers-in-the-world.17178/post-2674714 Although it all depends on the details.

I imagine a fairly tall enclosure with the two 18-inch drivers arranged vertically

Personally, I use separate subwoofers. It depends also

 

[Newman]

I’ve been playing with this loudspeaker idea for a while > a fully active four-way system based on

the B&C 18HTX100

I'm always magnetically attracted to concoctions like this, on principle. The love affair usually ends shortly after I see measurements.

I see it's a 'beaming' type horn, 90 degrees at 1000 Hz, 65 at 2000-4000, 40 at 8000, 25-30 degrees at 12000.

I just filed for divorce.

 

[Newman]

Why do you ask? Are you gonna keep l on dancing around the subject or do you have a point with that question?

I certainly do. I was thinking of replying to your #310, but it depends on what I can safely assume to be prior knowledge.

You seem to be aggrieved by everything I say and how I say it, so it's getting rather delicate.

So, have you or haven't you (read any of Toole's books in detail)?

 

[Tell]

I certainly do. I was thinking of replying to your #310, but it depends on what I can safely assume to be prior knowledge.

You seem to be aggrieved by everything I say and how I say it, so it's getting rather delicate.

So, have you or haven't you (read any of Toole's books in detail)?

The only reason why anything would be "delicate" and I might be aggrieved is because you are really annoying since you can't seem to answer anything. Yeah I know Toole, so could you PLEASE write anything on the actual subject we are discussion (or at least I am, I don't know what you are doing)?

 

[Sal1950]

I'm always magnetically attracted to concoctions like this, on principle.

Same here, I came from the generation when large coaxial speakers were the norm. A large 18" woofer like that combined with a somewhat large mouthed horn of a more modern design looks to be very interesting.

I just filed for divorce.

Have your lawyer sent the papers to include a generous $upport figure. I expect to continue a lifestyle appropriate to my standing in the audiophile community.