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audiofilofine wrote:

to reel from 7 volts or 700 volts is equal to the reel. should rather ask why or why 7 or  700 volts. should be asked how you intend to use the horn driver, you should ask graphs of frequency response and power handling. build a field coil driver is easy , it is not easy calculate voltages, impedances and which trumpets used to equalize the driver .. I do not see any of this work in Kilimanjaro. I do not understand how we can provide a driver that works in 7 or 115 volts only changing the solenoid, but can not play sounds good in both cases, changing too many parameters. part of rca driver are like this?  :     http://voltiaudio.com/midrangedrivers.shtml http://www.toutlehautparleur.com/bms/bms-diaph-4591-p-3116.html

Audiofilofine, they all valid points. I agree that to build a field coil drivers is very easy, in fact  much easier then perm magnet and I did wrote before that field coils mast be less expensive then permanent magnet drivers. To calculate voltages and impedances is also VERY simple. A bit more difficult to get the core mass for core built only in case of conversion. If one build a new driver then it is very easy. Again, what does it mean difficult? A qualified engineer shall give you the specification for core mass and coil parameters with an hour of work. It is how long it took for my engineer when I converted my S2 driver to field coil. So, is it difficult? I do not think so.

In my short exchange with Wolf von Langa he told me that he coil build any voltage, even 5000V field coil. I do not know if he said it juts to be nice or he has no idea what take to build 5000V coil. To have a magnetizing coil to be over 5000V rates it shell be VERY different winding and anti-corona isolation employed – it very different then 12-100 coils. Still his opines to do higher voltage coils is a nice fact.
It was mentioned and discussed at this site that higher magnetizing voltage is beneficial as it offsets the sound softening that is comes with coil heating.  It was not my idea but I find it extremely well noted and I am very enthusiastically support the concept. I did not try it personally (I have enough projects on my table for now) but I am absolutely certain that the concept will work perfectly fine.

The biggest question is what else will change if the voltage of solenoid goes up with all other equal conditions? Sure, the different coil impedance but would it be it? I did post the question to Wolf von Langa but he did not reply. I asked him is T/S parameters of the driver change with voltage change – it got to be in my view. Frankly I do not think he have answer to this question. I do not think a lot of people out there do. Audio people generally do not question too much own actions or own thinking. specifically the field coil tend to be absolutely immune to any cognitive sensibility. For whatever reason a typical audio Morons when he see a field coil label he collapse any brain faction and approach the driver banded, backward and with his pants down.

Yes, I do feel that change voltage from 12 V to 120 or to 240V will make a driver to be a different driver. It is possible that the diaphragm and it’s suspension need to be modified to optimize it for higher voltage and working with more energized magnetic field. But where did you see the field coil people ever talk about specifics not to mention to talk about the actual results. Did you even see anybody from the field coil clan to talk about sound of the divers? Never! At least I did hear/see it. Funny, but if they are trying to show off that they talk about sound then they avoidably copy each other words. So, I pretty much discard the field coil experience of others as I did not find it credible. My own experience with electromagnets made me do not want to go there - my perm mans drivers were clearly better. Still I would like to try the high voltage electromagnets as I do feel that there is a lot of promise in there.

About Wolf von Langa’s new RCA drivers. I do not know. To ignite interest of public, at least he public of my level of understanding he need come up with something more than historical essay and a few pictures. I do not care about history and I do not stupidly assume that it was vintage then it shall be good. Wolf von Langa made his own new driver and it need to be treated as a new driver. The fact that it uses the RCA architecture is fine - it make it no better or worse. It is a new driver and it need to be treated as a new driver. It’s it.

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