Help, need good LF 12'' (300mm) driver - Page 2 - diyAudio
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Old 19th July 2006, 08:22 PM   #11
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You mean the higher frequencies might sound "slow" because the Mms is too high? Or that the response will droop because Mms is too high?
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Old 20th July 2006, 12:03 AM   #12
ScottG is offline ScottG  United States
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Ummm..

Am I the only one that noticed that the sheet spec.'s:

*DUAL* VC's?

(..and all that might imply.)

Also if you look real close at the impeadance it would appear that Eminence does what everyone else does - parallel connect them to obtain a nominal 4 ohm load.
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Old 20th July 2006, 01:16 AM   #13
AJinFLA is offline AJinFLA  United States
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It will be very tough if not impossible to get a perfect fit. With that in mind, my recommendation for a drop in would be the HiVi M12 http://www.swanspeaker.com/product/htm/view.asp?id=84
Though more of a vented woofer, IMHO it would work just fine in a sealed 70-85L enclosure, Qtc around 0.5, F3 65hz (anechoic), which with room gain, should make -3db 30hz somewhat realistic, YMMV.

cheers,

AJ
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Old 20th July 2006, 01:48 AM   #14
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Thanks all you guys for helping, but it seems as all recomeded driver so far have something that makes me feel there must be something better out there. This is the one so far that has my attention it's the old ACI SV12, it's mmd seems low enough at 93 so can anyone run it through their good speaker program and let me know how it fairs.
85lts
no stuffing qtc and -3db point
100% stuffed qtc and -3db point.
Here are the only specs I can find on this driver

Cheers George
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Old 20th July 2006, 04:53 AM   #15
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Quote:
Originally posted by 454Casull
You mean the higher frequencies might sound "slow" because the Mms is too high? Or that the response will droop because Mms is too high?
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Old 20th July 2006, 05:43 AM   #16
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Quote:
Originally posted by 454Casull
You mean the higher frequencies might sound "slow" because the Mms is too high? Or that the response will droop because Mms is too high?
Maybe both, plus there could be cone breakup which would give distortions. That's my understanding, i could be wrong.

Cheers George
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Old 20th July 2006, 09:24 AM   #17
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by ScottG
Ummm..

Am I the only one that noticed that the sheet spec.'s:

*DUAL* VC's?

(..and all that might imply.)

Hi, no, but I assume it doesn't matter, /sreten.
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Old 20th July 2006, 09:43 AM   #18
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by georgehifi
Thanks all you guys for helping, but it seems as all recomeded driver so far have something that makes me feel there must be something better out there. This is the one so far that has my attention it's the old it's mmd seems low enough at 93 so can anyone run it through their good speaker program and let me know how it fairs.
85lts
no stuffing qtc and -3db point
100% stuffed qtc and -3db point.
Here are the only specs I can find on this driver

Cheers George
Hi,

I don't understand your concern with mmd, it tells you nothing
about the effective linear bandwidth of the driver, for a given
sensitivity of a 12" driver, the higher mmd is the lower the bass
you will get, if excursion capability is the same, the higher mmd
driver simply needs a bigger magnet.

green = eminence, yellow = contender (95L to account for stuffing)

/sreten.
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Old 20th July 2006, 10:25 AM   #19
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sreten, Yes my concern with the mmd stems from discusions with Neville Thiele here in Epping Sydney along time ago (25 years) when he helped me build a pair of 12cu ft vented sub enclosures for a pair of Kef B1814 oval bass drivers, F3 for memory was 16hz

I remember vaguely him saying that usualy the higher the mmd figure you may see a ragged roll off of a frequency graph in the highs of a bass unit where given the similar parameters a driver with a lower mmd usualy rolls off with a smoother trace thus having lower muddy distortion/cone breakup.

This is why I was asking, as it was 25 years ago and I wasn't sure about it, the last thing I want is to have a distorted bass roll off into the clean overlap of an electostatic lower mids

Cheers George
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Old 20th July 2006, 11:12 AM   #20
tinitus is offline tinitus  Europe
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If you really want better bass that fits your electrostat, then make a dipole line array with 10" drivers, and some mild bas EQ
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