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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Based on the fact that the has a 90 degree horz. Hi Lutz What other components are you planning on using with the or horn? Something to consider is the dispersions characteristics of the other nbl. If you try to match the horizontal dispersion of each of the components, then frequency response will be smoother off axis as hbl as on axis.

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.

JBL 2385a 60x 40 Flat Front Bi Radial Horn

The ideal match for the would be the A Bi-Radial horn. The A and the both have the same x degree coverage.

But, assuming for a 23385a, 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. And for the a Horn there are several options, the “Slot” or the new with the right PT wave guide would be best.

Since, you are also suggesting on using a 12″ driver as a low-mid range driver. Then the a might be better choice, as far as matching the 12″ driver’s dispersion characteristics at 1 KHz.

Zilch has already done a lot of the hard work involved in designing a system around this pair. Orginally I paired up the Renkus-Heinz horn with a bullet which I still havebut wasn’t happy with the HF coverage. Thats why I changed to the baby-cheeks. Honestly, for me the sounded so much better in the “sweet spot” but I stuck with the ‘s because I felt I got better HF coverage in room as a whole.


Is it your setup in your avatar? Can you post some pictures on it? I use A horn with h drivers in my ht. I will post pic’s next week. Baron, One more thought! I forgot I have a pair of drivers mounted on BiRadial x horns.

Lutz, I had a similar setup that ended up as per side 2- 15″ h’s 1- 12″ H 1- 2″ H 285a a A H tweeter I don’t think it was a ideal system but it had a lot of range. I had A’s on the system initially and preferred the A’s. The jbo up well with the I feel the shorter throw horns sound better in a room. The delay due to driver distance needs attention on this system. Blaster, Thanks for the reply, I didn’t even think of a A.

Your right, it does match the ‘s. Let me give this some thought. Also 2835a for sharing your Xover points. I think based on what you are doing I will try moving my Xover point for my a little higher. You are using 10, I have been at Our others points are almost exactly the same.

Hi Lutz I can fully understand what you mean by the ‘s “sweet spot”.

JBL 60° Biradial Horn

Unfortunately, that “sweet spot” is pretty small. But still, when you are listening in that spot, boy it’s so sweet For room coverage, I can fully understand why you like the baby-cheeks. After in taking into account your comments about room coverage. I personally think that you would find that the a has too narrow a coverage.

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If you look at the 23385a Isobar contour charts, within the a horn’s spec sheets, you will find that the dispersion pattern narrows as it goes higher in frequency. Fortunately, most of this change is in it’s vertical dispersion pattern.

But there 285a still some small changes in the horizontal dispersion as well. So, the a is going to have a horizontal dispersion that is ever narrower then 60 degrees, at your 6 KHz higher crossover point.

On the point of coverage, the a would do a better job. Others, have brought up the a horn as a possibility. I would strongly recommend going with a slightly higher crossover point of Hz with the a. The frequency response was a little choppy. And switching to Hz cleared things up nicely. And maybe, that explains why nobody makes a larger version of the A.


Hi Lutz, I have run all three flat front horns in all different sizes of room. I agree that the is far too “long throw” for your room. The is nice but the is even better.

Or, if you really like therun two of them with a degree angle between them. I have done this and it sounds pretty darn good. Make sure that you run the all the way up and just bring the UHF in at 10k or 12k with a 6db rolloff just to fill in the top end. And for some strange reason, I have always prefered the old driver to the ‘s, but thats just me.

Try an Hz crossover for the 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. One advantage not mentioned is the pattern control on the “large format” series over the flat-front series. This does make a difference when there aren’t any reflective walls and the crossover point is low. 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.

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If you remove the snouts on your ‘s, you can bolt them onto 1. Here is a picture of a pair jhl ‘s with the snout removed and mated to a pair of DDS horns that are very similar to the in pattern. Should you consider a pair of the ‘s, I have a pair sitting in storage. You can tell the TRUE audiophiles by the size of their horns, eh?