A – 2″ 60°x 40° FLAT FRONT BI-RADIAL HORN. The A JBL 2″ horn has a very controlled & tight coverage of 60°x 50°. Excellent directivity factor of Find great deals for JBL a 60x 40 Flat Front Bi Radial Horn. Shop with confidence on eBay!. The JBL A Bi-Radial. horn is designed for flush cabinet mounting or compact cluster A has a nominal 60° horizontal x 40° vertical.

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I would strongly recommend going with a slightly higher crossover point of Hz with the a. For room coverage, I can fully understand why you like the baby-cheeks.

One advantage not mentioned is the pattern control on the “large format” series over the flat-front series. Make sure that you run the all the way up and just bring the UHF in at 10k or 12k with jlb 6db rolloff just to fill in the top end. But there are still some small changes in the horizontal dispersion as well.

Then the a might be better choice, as far as matching the 12″ driver’s dispersion mbl at 1 KHz. Thats why I changed to the baby-cheeks.

Listing – JBL A 2″ INCH HORN FLARE – Detail – SPEAKERS –

This does make a difference when there aren’t any reflective walls and the crossover point is low. If you try to match the horizontal dispersion of each of the components, then frequency response will be smoother off axis as well as on axis. Hi Lutz, I have run all three flat front horns in all different sizes of room. On the point of coverage, the a would do a better job. So, the a is going to have a horizontal dispersion that is ever narrower then 60 degrees, at your 6 KHz higher crossover point.


The matched up well with the The is nice but the 23385a even better.

Orginally I paired up the Renkus-Heinz horn with a bullet which I still havebut wasn’t happy with the Jb, coverage. And for the a Horn there are several options, the “Slot” or the new with the right PT wave guide would be best.


Fortunately, most of this change is in it’s vertical dispersion pattern. I agree that the is far too “long throw” for your room.

I have done this and it sounds pretty darn good. I had A’s on the system initially and preferred the A’s. Based on the fact that the has a 90 degree horz.

Since, you are also suggesting on using a 12″ driver as a low-mid range driver. Something to consider is the dispersions characteristics of the other components. JBL does or did make large biradial horns of that type–the series.

Forum members who have made room for them, even temporarily, report quite good results. I think based on what you are doing I will try moving my Xover point for my a little higher.


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Can you post some pictures on it? Unfortunately, that “sweet spot” is pretty small. The delay due to driver distance needs attention on this system. Then I am not sure that any of the Flat-Front Bi-Radial Horns would be a good match as far as dispersion patterns are concerned. Is it your setup in your avatar?

I forgot I have a pair of drivers mounted on BiRadial x horns. And switching to Hz cleared things up nicely. I personally think that you would find that the a has too narrow a coverage.

But, assuming for a moment, that you really got your heart set on a 2″ throat Flat-Front Bi-Radial Horn, then swapping out the for something else might be a better choice.

JBL 2385A FLAT-FRONT BI-RADIAL (Free Shipping)

You can tell the TRUE audiophiles by the size of their horns, eh? I have used nearly all 2″ horns jbl has made in various projects and while the will give you the wide dispersion, the X series of 1.

Should you consider a pair of the ‘s, I have a pair sitting in storage. Also thanks for sharing your Xover 238a. Or, if you really like therun two of them with a degree angle between them.