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Old 9th November 2012, 11:15 PM   #141
Nelson Pass is offline Nelson Pass  United States
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I estimate that pair of Lowthers at 94 dB. The field coils are stronger, but my
favorite 16 ohm silver overhung (love that word...) voice coils normally give
only 92 dB with the regular PM6A magnets.

It is amazing how loud they can play with what would the equivalent of a
1 watt (8 ohm) amplifier.

 
Old 9th November 2012, 11:25 PM   #142
Wavebourn is offline Wavebourn  United States
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Quote:
Originally Posted by Nelson Pass View Post
It is amazing how loud they can play with what would the equivalent of a
1 watt (8 ohm) amplifier.
How much more it requires to be magnetized for such sensitivity? 30W constantly, or more?
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Last edited by Wavebourn; 9th November 2012 at 11:27 PM.
 
Old 10th November 2012, 03:56 PM   #143
Nelson Pass is offline Nelson Pass  United States
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I was running 13.8V at 3 amps on each coil. They got quite hot over the
course of the day.

 
Old 10th November 2012, 06:41 PM   #144
Antoinel is offline Antoinel  United States
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Quote:
Originally Posted by Nelson Pass View Post
I was running 13.8V at 3 amps on each coil. They got quite hot over the
course of the day.

Mr. Pass: Please consider doing this experiment for science and fun:
  • Energize the Field Coil at 1 or 2 or 3 Amps. Temperature?
  • Energize the voice coil with a 0.5 W music power with F6.
  • Evaluate the quality of the acoustic output at each FC exitation amperage.
DIYers and I will appreciate you valuable observations.

Brgds
 
Old 10th November 2012, 06:50 PM   #145
nicoch58 is offline nicoch58  Europe
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too many $$ for DIYers , 6000$ ,better use a dedicate psu !
 
Old 10th November 2012, 06:53 PM   #146
Wavebourn is offline Wavebourn  United States
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Why $6,000 - were they wound by virgins manually?
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Old 10th November 2012, 06:56 PM   #147
nicoch58 is offline nicoch58  Europe
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ask lowther-america...

Last edited by nicoch58; 10th November 2012 at 06:59 PM.
 
Old 10th November 2012, 07:05 PM   #148
Wavebourn is offline Wavebourn  United States
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I asked on AES guys who made subwoofer propellers, why so expensive. "Because we want to return investments". Funny...

I would be glad to install such propeller under the floor instead of cone drivers, but the price...
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Old 10th November 2012, 07:09 PM   #149
Antoinel is offline Antoinel  United States
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Why $6,000 - were they wound by virgins manually?
SUPRAVOX 215 EXC [made in France] of like design costs about $1,400 per driver when imported from Canada to the US.
 
Old 10th November 2012, 10:44 PM   #150
Jon Ver Halen is offline Jon Ver Halen  United States
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Quote:
Originally Posted by Wavebourn View Post
Why $6,000 - were they wound by virgins manually?
Gee's, I have not asked Dave if he is a virgin. That would probably come as a shock to his children, but it is possible. Dave does manually wind them though, and there is a lot of copper, steel, machine work, plating, etc. involved. I won't go into the cost of business, but will say this is more a labor of love than anything.
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