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Pass Labs B4 crossover questions
Pass Labs B4 crossover questions
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Old 13th March 2018, 09:27 AM   #181
richluvsound is offline richluvsound  United Kingdom
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What horn are you using Marconi ? I understand the 2450 needs some eq .. ?
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Old 13th March 2018, 09:29 AM   #182
marconi118 is offline marconi118  Germany
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jbl cinema waveguide 1.5'
and jbl 2405 as super tweeter
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Old 13th March 2018, 10:33 AM   #183
richluvsound is offline richluvsound  United Kingdom
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It’s been suggested that a tweeter isn’t needed.
I thought about adding 045BE , but after many conversations and living with 2435 in a 2-way I must admit I’m a little torn . I’ll add it if needed . I want to see how close I can get this combination to my TAD 2404 .
I
Have another pair of H9800 if you’re interested ?
Richard
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Old 13th March 2018, 11:35 AM   #184
marconi118 is offline marconi118  Germany
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send me sope picture and price per PM
how low can they go?
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Old 14th March 2018, 01:41 AM   #185
tyman63 is offline tyman63  Singapore
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Quote:
Originally Posted by Nelson Pass View Post
Got a driver voltage curve for it?
See post#2 for the SPL and impedance plot.

Truextent Diaphragms in JBL four-inch compression drivers

I have the 2446H with Yuichi A290 horn (blue plot).

The low end is open-baffle AE Dipole 15.

Plan to cross at 600Hz region (recommended for the A290 horn)

Last edited by tyman63; 14th March 2018 at 01:48 AM.
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Old 14th March 2018, 07:20 AM   #186
richluvsound is offline richluvsound  United Kingdom
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Default Post 34

Quote:
Originally Posted by marconi118 View Post
send me sope picture and price per PM
how low can they go?


Truextent diaphragms measurements - Page 3


Rich
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Old 14th March 2018, 06:00 PM   #187
Nelson Pass is offline Nelson Pass  United States
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Pass Labs B4 crossover questions
The LXmini crossover itself would have the wrong settings, but the
board design should pretty much accommodate the curves I saw
assuming that 12 dB/octave is a suitable slope for you. It looks like
you might want a gentle depression in the upper mid, which is
allowed for in the artwork.

If you knew what curve you wanted specifically, then fixed resistor/cap
values could be used, and the existing LXmini artwork could serve.
However, I suspect that an adjustable version is what is going to be
needed, as I doubt we know the exact curves.

I have such a version in the works, where there are pots on the board,
allowing a 3:1 adjustment of frequencies for the crossovers and some
smaller adjustment for a low Q notch. If I stick it on my vast to-do list
it could be ready in a month or so.
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Old 14th March 2018, 06:47 PM   #188
richluvsound is offline richluvsound  United Kingdom
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Default 2450sl/BE on H9800

H9800 clone with Truextent/2450sl
Attached Images
File Type: png Screen Shot 2018-03-13 at 19.10.01.png (454.5 KB, 246 views)
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Old 15th March 2018, 03:01 AM   #189
luxwinter is offline luxwinter
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I want to try the DIY B4 in a biamp setup for a pair of Tannoy Monitor Golds. The circuit for the horn in the passive crossover incorporates a notch filter at ~ 3kHz and a slope correction at higher frequencies. I was thinking I could just retain that part of the passive crossover and use the B4 for the high and low pass. Does that make sense, or is it likely to be better to incorporate all of the corrections in the active crossover (which sounds pretty complex...).
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Old 15th March 2018, 03:50 AM   #190
Nelson Pass is offline Nelson Pass  United States
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Pass Labs B4 crossover questions
Got a curve we can see?
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