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In the Forum: Horn-Loaded Speakers
In the Thread: Vitavox S2 with Electromagnets
Post Subject: Another 2 centsPosted by haralanov on: 2/26/2010
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 Romy the Cat wrote:
So, you feel that high voltage filedcoil do excite the electromagnets driver somehow?

I will not call this exitation, let say it dynamic stability.

 Romy the Cat wrote:
What voltage you feel is appropriate?

It very much depends of the S2's magnetic circuit topology and the free space you hаve inside the driver. There are too much factors to consider.

 Romy the Cat wrote:
If 120V is better then 12V then why not the 380V for instance?

The higher, the better, but in that case you need entirely different magnet system design. So you have some limits. I have never disassemled Vitavox S2 driver and I don't know what will be the proper solution to convert it to electromagnet. I'm in the process of constructing massive (over 15" high) field coil, with more than 28000 meter of copper wire, working at 800V DC and made of Armco ultra low carbon iron.

 Romy the Cat wrote:
You went to the troubles to use DC battery to drive your 120V coils, why DC battery?

I'm using accumulator power supply for purely sonic reasons. It is very very pure. The only drawback is that the accumulators need to be charged with every 90-100 hours of use. I even use 80uF non-electrolytic russian military capacitors attached to the back of the magnet system and wired directly to the field coil terminals.

 cv wrote:
But I wonder if, Haralanov, you have experimented with current sourcing the coils - I would imagine that this would vastly reduce the differences you are hearing

I will do that IF some day I hear something that I do not like in the sound and only if the reason is related to the power supply. Right now I do not have any motivation to change something because there is absolutely nothing annoying in sound of my FC driver.

 cv wrote:
  Dave Slagle is in the process of making some low impedance coils for what was a high impedance driver, so he may have the answers, both theoretical, and soon, practical: http://www.hifiheroin.blogspot.com/
(see the Wireman post)

Sorry, but this guy do not make changes based on sonicaly related reasons, so his actions are absolutely irrelevant to me. He said (quote taken from the link above):

 Wireman wrote:
and decided to take them from high voltage to low voltage for safety reasons.

And this is the most moronicaly thing I have ever heard! All of them do that for "safety" reasons (not because of the Sound they want to accomplish) which is very very sad in fact.

Best Regards,
Haralanov

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