Preparing to upgrade the HF on the Cinema JBL's - AVS Forum
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post #1 of 2 Old 09-20-2012, 03:33 PM - Thread Starter
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This weekend I will be measuring the various combos I have managed to accumulate.
Comprised of: Horns/wave guides: 2384 , PT-H95, 2352 all are 90 x 50 (Zilch very much liked the last two)
CD's 2430, 2431, 2447 and finally 2450-SL
I will do 1M sweeps with OmniMic. I'll disconnect the LF section but will use the stock JBL 4622 network
and be well clear of boundaries. Changing the x-over is not an option right now, though I'm sure Max would help me.

Based on data published on LH, the 2450-SL should perform the best. Some preferred it over the vaunted 435 with the BE phragm. http://www.audioheritage.org/vbulletin/showthread.php?31657-Truextent-diaphragms-measurements

My next upgade will be to install the Truextent phragms in the 2450 CD's. Oh and John, you always ask what I think I'm missing with the standard 4622's. I don't know unless I tinker!
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post #2 of 2 Old 09-20-2012, 06:22 PM
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cool test.

i just don't know how much of any subjective differences will be frequency response related vs. other driver aspects given the use of a single passive network. i'm interested in your test though...lurking for sure.

"My next upgade will be to install the Truextent phragms in the 2450 CD's."

what does something like that go for these days?

Listen. It's All Good.
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