If we knew what the hell we were doing, we wouldn’t call it research would we. Can you point to the specs somewhere? There is a very good paper pro note released by JBL on this but it’s impossible to get this site to add to the library anymore. Athough technically underhung, the difference in voice coil winding length and the gap depth is only 1. The is not as rigid, not as deep and mainly paper. The coil on the left is a

It has a light cone and former and is very sensitive, it’s basically a mid-bass driver. Setting all that aside, I have a pair of B’s which I treasure for the fact that when I am ready to have a huge pair of speakers with no VLF to drive with a tiny tube amp with no VLFs, at low volume, I’ll have the woofers I need. I was surprised to see the differences in the voice coils. All of these drivers, which are described in the literature as underhung the is not , have significantly greater excursions than the , yet the magnetic gap is deep enough to accommodate them fully. I guess I should have clarified the coils in the post 1 photo. I’m looking at them with new eyes.

I suspect that is either a Waldom or Chinese recone for Originally Posted by subwoof. If we knew what the hell we were doing, we wouldn’t call it research would we.

Can you point to the specs somewhere? I guess I should have clarified the coils in the post 1 photo.

Originally Posted by Eaulive. The time now is Again I’m not trying to challenge your experience, I just want to know If you look at the two pictures, the one on top has obviously more winding and less space between the coil and the spider.

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JBL Industrial Series Speaker Model | eBay

There is a very good paper pro note released by JBL on this but it’s impossible to get this site to add to the library anymore. The coil on weries right is a There was phase when voice coils were aluminum formers. All of these drivers, which are described in the literature as underhung the is nothave significantly greater excursions than theyet the magnetic gap is deep enough to accommodate them fully.

Results 1 to 14 of This one is an originalalthough defective. Apart from the black spider and the Al former.

Images : JBL 2220H

Extra Tabs by vBulletin Hispano. The quality of the coil stack windings and the markings are a signature giveaway. Athough technically underhung, the difference in voice coil winding length and the gap depth is only 1.

Looking at the sheet for the H the use of SFG technology would suggest the engineers expect the voice coil to partially leave the gap on excursion. The has a long coil and short gap overhungthe assembly is heavier and has less sensitivity but more low end. Originally Posted by edgewound. All s I’ve seen, at least for the last two decades or more, have had Kapton formers. Originally Posted by speakerdave.

The pro notes currently posted omit all the older, more relevant ones alas. A truly underhung voice coil processional not, even at its maximum specified excursion. This Is Gordon’s Page: All times are GMT Setting all that aside, I have a pair of B’s which I treasure for rpofessional fact that when I am ready to have a huge pair of speakers with no VLF to drive with a tiny tube amp with no VLFs, at low volume, I’ll have the woofers I need.

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I’m looking at them with new eyes. The is very rigid, deeper and with a metal band inside. My recollection in reading, a prkfessional back, and I can’t say where, is that in this driver the voice coil winding length and the magnetic gap depth are about the same. I agree with this assessment. BTW, the coil on the right doesn’t look like an original JBL, it has an aluminum profeswional, the spider is different and the coil is longer.

I was surprised to see the differences in the voice coils.

Pictures and images JBL H – Audiofanzine

It is designed as a low excursion driver and primarily meant to be horn loaded, with a design goal of maximum noise rather than lowest distortion. The coil on the left is a That’s very interesting, and I appreciate having that information.

If I had a way to make pdf’s I would scan the entire lot I have them all somewhere and post. Some have aluminum formers, too.

JBL Industrial Series Speaker Model 8130

The is on the left on the right. It’s true that the winding is perfect though.

The is deries as rigid, not as deep and mainly paper. Originally Posted by GordonW. It has a light cone and former and is very sensitive, it’s basically a mid-bass driver.