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RE your "or don't bother?" According to Eargle there's a far more important issue in routine SR than delay. And he questions the audible nature of...

Not sure about the efficacy of putting a steel bolt through air coil inductors...

That is my understanding. Widget

Part 2

Just a little something from John Eargle

Maybe you can use some dusted 4" titanium - diaphragms in your horndrivers? These should be available new for aprox 120$ and should be some kind...

Thanks Widget, will do. I've certainly enjoyed the journey so far. Thanks for the photo of a young John.

Hi trip, The answer to your question is compression driver, the way Earl mentioned. However the don't bother may also apply (i'll be back later to...

Hi, The others chiming in on the C36 question are correct. I have studied the C-36 and C-38 lineup in great detail, and they were a solid design...

Hi Widget, Does that mean that JBL still produce Be Diaphragms with 'diamond shaped suspension" (476Be) ? Regards Ivica

Shown in the pictures attached are the early old crossover with my scratch built replacement and parts using. I am pausing before soldering to get...

I've never seen this particular model but the light bulb in series with a speaker driver is a widely used trick to prevent burn out. As the current...

For extra points use an FFT measurement app and measure the arrival time for the woofer and horn driver individually if you want to get it down to a...

Let me add to the conversation Hafler power amps and pre-amps. Another pro power amp that was good were AB International power amps. I never had...

Probably have made and sold 100 pairs of replacement foam grilles for the 7 and 9 models over the years - still do: ...

thk you Earl!

Greg Timber’s advice is to use a 3rd order electrical filter on the 2405 per 3144 schematic. I would look at the Jbl 3107 passive crossover for clues.

The Acoustic Center of a driver is usually somewhere around the vertical plane of the voice-coil. So, measure the distance between the 2 voice...

Thank you for the detailed response! Compared to me, you've tried quite a few amplifiers. Seeing as you frequented a Mac dealer and got to try...

Thanks for the info, Widget. No wonder he hasn't commented on this forum or elsewhere, died in '07. I'd like to get my hands on a copy of "The JBL...

Actually, they do. A friend put a pair of d123, in each cabinet, 12 cubic feet, and feed them with a Crown DC-300 .

These are from 1978 http://www.lansingheritage.org/html/altec/catalogs/1978-home.htm

We find John here in an advert for Dolby circa 1970.

If you can swing it, I would go with the 2216ND over all of the others. The 2235H is an upgrade, but I wouldn't spend the time and money on it as...