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W8-1808 vs W8-2145
W8-1808 vs W8-2145
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Old 19th October 2017, 01:05 PM   #21
moloch is offline moloch  France
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Hi xrk971,

just a quick update of the values:

BSC: 1mH, 5.6 ohms
NOTCH: 0.22mH, 12 ohms, 10µF (only the 3K spike)
ZOBEL: The Le is missing for the Betsy. If someone could get it I will be able to calculate the good values.

regards,
seb
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Old 24th October 2017, 07:17 AM   #22
norman bates is offline norman bates  United States
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Still all good ?
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Old 24th October 2017, 10:03 AM   #23
moloch is offline moloch  France
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Hi Norman,

yes this driver sings still very well. I'm planning to implement a tweeter, it works nicely without, but the sweet spot is thight unless I toe the speakers in to a "isocele" configuration. When I do that the deepth of the stage comes to life, but the width is a bit shrinked. I would a sound that cames out the speakers, like left of the left speaker and right of the right speaker. I had this kind of stage with a W4 1320 in a MLTL.

The speaker starts to beam at 2Khz-ish, I wonder if the crossover frequency is better at 2K, or 5Khz to let all the "idiophile magic" of the voice, but there will be some lobbing problems between the dispersion of the FR and the dispersion of the tweeter.

Anyone did experiment FR + tweeter?

regards,
seb
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Old 24th October 2017, 07:46 PM   #24
norman bates is offline norman bates  United States
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Me.
Nothing wrong with a 6db time aligned crossover, at all.
24db @ 5khz is close but not better to my ears.

Given the impedance plot is flat on th 2145, that will make it much easier to do a crossover.
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Old 25th October 2017, 11:09 AM   #25
moloch is offline moloch  France
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Hi folks,
some measurements here. I've mesured it on a 70L BR 50Hz tuned, reverberant place.

regards,
seb
Attached Images
File Type: jpg directivité.jpg (194.4 KB, 517 views)
File Type: jpg phase.jpg (199.2 KB, 518 views)
File Type: jpg reponse impulsionnelle 6K.jpg (391.1 KB, 514 views)
File Type: jpg reponse impulsionnelle 20K.jpg (396.0 KB, 508 views)
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Old 26th October 2017, 02:32 PM   #26
moloch is offline moloch  France
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I design a MLTL for the W8 2145
30Hz@-3dB

length: 143cm
CSA 880cm²
driver 62cm from the top

port: 110cm² area, length: 12cm

stuff the up 2/3 with 1Kg of fiber.

regards,
seb
Attached Images
File Type: jpg w8 2145 F response .jpg (43.4 KB, 481 views)
File Type: jpg W8 2145.jpg (134.7 KB, 179 views)

Last edited by moloch; 26th October 2017 at 02:40 PM.
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Old 26th October 2017, 03:15 PM   #27
moloch is offline moloch  France
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Quick update for the BETSYK zobel+notch:

BSC: 1mH, 5.6 ohms
NOTCH: 0.22mH, 12 ohms, 10µF (only the 3K spike)
ZOBEL: 7.12 ohms, 6.3µF

regards,
seb
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