Custom 15" Field Coil Woofers *Look* - diyAudio
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Old 2nd May 2005, 03:46 AM   #1
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Thumbs up Custom 15" Field Coil Woofers *Look*

One pair of 15" woofers, 500 ohm field coils, new 8 ohm voice coils, new custom spider, new cones, new Altec cloth surrounds. The field coil must be energized with 50-110 VDC. Very efficient (100db+ with a watt!) and extremely fast- These will do the bottom octave with shocking authority and control and have bass and low mid reproduction to die for- These bass drivers are Altec, JBL. Supravox, Western Electric, RCA, Focal, TAD, ect.. killers. If you haven't heard a good field coil woofer system you will be shocked when you fire these up.

If you want the BEST look no further.

$650 pair plus shipping.

I also have a spare Kepco 0-100 VDC regulated variable power supply. It's perfect for energizing the coils. It however is fan cooled and is quite noisy. I've used it in an adjacent room with great results. $50.00 with the woofers.

Ohio

magnetar@joimail.com
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Old 3rd May 2005, 03:37 AM   #2
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I've decided to keep these bad boys.

Sorry to all who inquired.
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Old 3rd May 2005, 08:06 AM   #3
AndrewT is online now AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Hi,
I have heard of electromagnet speakers.
I was thinking about making some after reading a web page showing the design and manufacture of the field coil system.
Can you post or email details since yours are no longer available?
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regards Andrew T.
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Old 4th May 2005, 06:02 AM   #4
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Sensitivity is quite high. What's the F3 in free-air?
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Old 4th May 2005, 12:53 PM   #5
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Quote:
Originally posted by AndrewT
Hi,
I have heard of electromagnet speakers.
I was thinking about making some after reading a web page showing the design and manufacture of the field coil system.
Can you post or email details since yours are no longer available?
They are simply electromagnetic - what we used before Alnico, Ceramic, ect... I have a local speaker 'restorer' that winds his own coils, builds his own cones, builds custom spiders ect.. These started out as Baldwin Model 10 woofers (A $30,000 organ made in the 30's that was designed to mimic the output of a pipe organ with little PP amps in a large hall or church) and the restorer and I collaborated a modern update to them. He is also helping me with other drivers some that turned out not so good as these and some that are really excellent.


Electromagnets
Experiments with electromagnets

Quote:
Originally posted by 454Casull
Sensitivity is quite high. What's the F3 in free-air?

25 cycles with these - I have another pair that uses a different spider and cone that is around 40 cycles.]
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Old 4th May 2005, 06:43 PM   #6
tiroth is offline tiroth  United States
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Location: Pittsburgh, PA, USA
Quote:
Originally posted by 454Casull
Sensitivity is quite high. What's the F3 in free-air?
You might want to factor in the wattage of the "heaters".
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Old 6th May 2005, 05:58 AM   #7
Tweeker is offline Tweeker  United States
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Location: Cincinnati, Ohio
Wow! Magnetnar had changed his mind after I paid, but paypal had failed to notify him. He decided to send them anyhow. This is by far the best sounding woofer shoved into a cardboard box Ive ever heard, they have huge range. I just ran full range to test and you certainly wouldnt have guessed it was a lone 15 stuck in a television box with the back cut out of it.
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Old 6th May 2005, 11:45 AM   #8
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Quote:
Originally posted by Tweeker
Wow! Magnetnar had changed his mind after I paid, but paypal had failed to notify him. He decided to send them anyhow. This is by far the best sounding woofer shoved into a cardboard box Ive ever heard, they have huge range. I just ran full range to test and you certainly wouldnt have guessed it was a lone 15 stuck in a television box with the back cut out of it.
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Old 9th May 2005, 02:07 PM   #9
Tweeker is offline Tweeker  United States
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Click the image to open in full size.
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Old 9th May 2005, 06:18 PM   #10
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I love it!

How do they sound?

Here's one of my weirdo systems

TAD drivers with electrostatic tweeters...

Click the image to open in full size.
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