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Multi-Way Conventional loudspeakers with crossovers

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Old 27th July 2008, 12:08 AM   #4331
KBK is offline KBK  Canada
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A Simple question..simple answer.

Why is field coil superior to all other 'dynamic' style (magnet, basket, cone, etc) drivers?

It's and old civil engineering thing. '3 to 15' it's called. Let's see who 'gets it'.
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Old 27th July 2008, 10:24 AM   #4332
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I'm hanging onto my Epos ES11's until they become "retro" and/or "vintage" and their value quadruples...
Nice speaker for what they are, glad I've still got 'em
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Old 27th July 2008, 11:33 AM   #4333
SunRa is offline SunRa  Romania
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Hello mikey,

do you have a close-up with your speakers? I can't find a proper picture on the web to stare at the surround
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Old 28th July 2008, 07:21 AM   #4334
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Hi SunRa,
They continued with the idea, have a look at the current M22i:
M22i zipped hirez photo

Cheers,
Mike
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Old 28th July 2008, 07:26 PM   #4335
SunRa is offline SunRa  Romania
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Thanks for the picture Mike!

However I don't get it what's so special with this surround. It seems to me that the suspension is still glued to the cone. For example in some Hartley woofers the surround and the cone are the same body. This is said to greatly reduce the edge artefacts.

I've also seen this on a paper cone. The surround was formed from the edge of that cone.

I'll try to post a picture later.
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Old 29th July 2008, 07:47 AM   #4336
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Quote:
Originally posted by KBK
A Simple question..simple answer.

Why is field coil superior to all other 'dynamic' style (magnet, basket, cone, etc) drivers?

It's and old civil engineering thing. '3 to 15' it's called. Let's see who 'gets it'.
KBK, I'm afraid the "3 to 15" reference is a little too obscure. Why?

Well, I'm married to a Civil Engineer who went on to work for the US Army Corps of Engineers in the Portland District for 20-plus years, and she had no idea what it meant - and Karna is a pretty sharp cookie, with a background in biochemistry, civil engineering, and a mainframe computer systems analyst. Is it some kind of regional or national reference?
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Old 29th July 2008, 07:56 AM   #4337
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3 to 15 = pneumatic control? As in 3-15 p.s.i.?

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Old 2nd August 2008, 11:29 AM   #4338
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Nick,
Do You have dimension drawings Yours 15" and new 18" drivers?
Something like this:
http://profesional.beyma.com/ingles/pdf/18P1200Nd.pdf

Can You send drivers to Poland?


Best
C
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Old 2nd August 2008, 03:22 PM   #4339
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Default mechanical resistance

I don`t remember anyone ever mention the importance of low mechanical resistance (Rms) while choosing the bass drivers, only magnets, voice coils and cone types. Aluminum VC formers seem to slow down bass transients considerably, as well as lack of venting the magnet/coil structure.
From my experience, low mechanical resistance plays a very important role for the "subjective" speed of woofers. The higher the Qms or lower the Rms, the better or livelier is the reproduction of bass transients. That of course among other factors, but I`ve never encountered any woofers with low Rms to sound detailed in the bass.
Only Tony Gee from Netherlands seems to pay attention to it:

http://www.diyaudio.com/forums/showt...812#post806812

example of extremely low Rms 15" :

http://oem.ciare.com/it/296/346/prodotti.php
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Old 2nd August 2008, 06:30 PM   #4340
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I am presently using two of these vertically mounted on an 18" wide board.
http://profesional.beyma.com/ingles/pdf/SM115N.pdf

The 2008 version of this LS has more normal close folds in the cloth surround, so it looks different to the manufacturer's photo in their PDF.

I have the tightest/cleanest bass yet when driven using this circuit with a 500VA 2x 40V toroidal trafo, 1000uF capacitor and another choke circa 2.2mH in series with the driver. No resistor in series with the 6.4mH choke; one ohm in series with the capacitor.
My amplifier is 1 ohm capable so I have no worries there.

Other drivers likely to sound good with this circuit, especially larger ones.

Cheers.......... Graham.
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