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Hello,
I have got some Altec 806-802 and 414-414 speakers that I would like to be remag'ed in order to match them (before reconing the the 41X) . Since the shipping cost to USA is too high, I found here in Switzerland, a Company who probably could do the job. However I would like to know the procedure: should I send them the internal AlNiCo magnet only or the full motor assembly? They are not specialized in loudspeakers and I would like to have control!
Many thanks,
Jean-Paul
Motor/driver assemblies are generally charged only when assembled.
Disassembling an alnico motor will discharge the alnico slug.
Charging is generally the last, or nearly last step of building/re-building a woofer.
I would strongly advise having re-magnetization done ONLY by a reputable and and experienced speaker technician.
Having a shop that has no experience with delicate, and close tolerance loudspeaker motors do work for you is a poor exercise in economy, in my opinion.
And we remember the horror stories of reverse polarity magnetizing that occurs with Alnico when they leave the machine in Ceramic magnet mode. Agree 100% with bowtie about the qualified personnel. Worth spending the money on IMHO.
+2, I agree with Cal & Bowtie.
Can you imagine trying to re-assemble a fully charged alnico slug into a motor assembly(with the precision necessary for a proper gap and alignment)?
My understanding is that GPA's gausser, and the procedure by which the magnets are charged is very similar to the one seen in this video at 2:05.
[How It's Made] Building a Speaker - YouTube
JBL has/had a custom-made magnetizing machine. I still have their brochure stated it, it was back in 1975.