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  1. Replies
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    It is cone angle, material, etc. Damping the...

    It is cone angle, material, etc. Damping the dome can actually make things worse as it tends to decouple the dome from the cone/coil and it can take off on itself. However, sometimes it helps. ...
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    Yep.

    Yep.
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    I can assure you that neither of us even approach...

    I can assure you that neither of us even approach a 7 figure salary, or even $200k for that matter. What is interesting, and sad, is that both of us are still top of the heap in the engineering...
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    They have the same coil and motor. The 128H is...

    They have the same coil and motor. The 128H is less deep and has a much smoother response out past 800Hz. The 2214H is slightly louder and has a much deeper cone. It has a pretty nasty peak...
  5. Correct, just frame lip color. They all (both...

    Correct, just frame lip color. They all (both versions) are acoustically identical. Both use the classic 0.750 long coil in a 0.280 gap. Over the years the coil grew to 0.800 but they are...
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    All 250 models were made in Northridge. All...

    All 250 models were made in Northridge. All models had exactly the same enclosure dimensions and were built basically the same way. The woofer and mid bass were the same in all models. Only the 5"...
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    The The E-145 has the same magnet assembly and...

    The The E-145 has the same magnet assembly and voice coil as the LE-15. The gap is 0.600" long and the coil is .280 long. We didn't pay much attention to x-max back then and there wasn't a...
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    Another sad day for JBL

    JBL (Harman Luxury) laid off 3 more employees yesterday. Their seniority totaled over 70 years. The big hit was Jerry Moro. Jerry's work is legendary and his transducers have been featured in most...
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    OMG, somebody actually got a pair!!! I'm glad...

    OMG, somebody actually got a pair!!! I'm glad you got them home safely. They didn't look as tall as I remember unless you are 6'8" or so. Keep me in the loop as you move forward. We can...
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    Other than being a face only a Mother could love,...

    Other than being a face only a Mother could love, the Studio series is really great sounding stuff. The little compression driver is amazing and Jerry Moro did a great job on the woofers. We had...
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    As Ian correctly stated, everything involves...

    As Ian correctly stated, everything involves compromises. The 2430 has a distortion issue between 750 Hz and 1500 Hz compared to the 476 family. It does many other things extremely well including a...
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    385,016

    I'm Back! (if only for a moment)

    Congratulations to those who have received their 4367's. There are a ton of misconceptions regarding the speakers. i can comment through the DV run after which I was no longer involved. The...
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    Sticky: End of an Era. 43 years with JBL is Over

    I was unceremoniously separated from employment by Harman following a 90 second explanation. My position was eliminated! Following an explanation of benefits, I was escorted out. The timing came...
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    Rew 5

    REW 5 is the way to go. Be sure to get the Beta version that corrects the curve averaging method. For Mac, it is Beta 20. I use a Scarlett i212 as an external sound card. Most PC's have lousy...
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    Holy Smokes, What a great Evening!

    Dear All,

    The dinner event at the home of Titanium Dome will surely be one of the highlights of my career at JBL. I was overwhelmed by the outpouring of good wishes and thanks for years of...
  16. I was asked to make a brief response to this last...

    I was asked to make a brief response to this last post, so here it is. The capacitor biasing is something that has existed for many years. Tube equipment does it automatically since there is...
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    Everyone is entitled to his opinion, however, we...

    Everyone is entitled to his opinion, however, we have hard measurements in addition to much subjective listening that shows that the application of Aquaplas to the metal diaphragm of our compression...
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    Oops! Too much power. Those Metal Oxide...

    Oops! Too much power. Those Metal Oxide resistors sound very nice but are not as robust as the wire wounds we typically use, I am not in the office today so I am not sure exactly where in the...
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    My mistake. Mark Glazer is the correct spelling....

    My mistake. Mark Glazer is the correct spelling. Not the former head of Madrigal who is a marketing guy. We had the same problem here when they were both on the phone list at the same time. Like...
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    I am going to pop in quickly and correct a common...

    I am going to pop in quickly and correct a common misconception. After which, I will disapear again.

    Revel product, specifically the Ultima original and current new models are and always have...
  21. I am not aware of anyone who has actually heard 3...

    I am not aware of anyone who has actually heard 3 channel yet. I have done 4 channel here at Northridge briefly when I actually had 4 systems at one time. The result was unreal. Several sets of...
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    Everest Notes

    Somebody estimated 277 Liters. You get an A. We figure the active volume is around 270 l. As with all Japan intended systems, the low end is deliberately lean. The published curve is an anechoic...
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    Here's the Scoop

    Ferrite magnets do not demagnitize with time or drive. They are affected by temperature but that is reversible. They will return to normal when they return to room temperature. Ferrite is...
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    You Guys are Amazing

    I can't belive all the interest in this 30 year old system. It was never very successful during its life time primarily due to its size. Most people would get something smaller. It also had a...
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    The Truth, at least as I see it

    The plain and simple reason for the existance of the 045Be and 045Ti is that the 435Be and 435Al (2430 and 2435 are similar) have a substantial response problem around 10 kHz on many horns and are...
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