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In the Forum: Horn-Loaded Speakers
In the Thread: Jessie Dazzle Project
Post Subject: Process-related ramblings & remagnetizingPosted by jessie.dazzle on: 8/3/2008
Oops,
I'll send the images again once back at work on Monday.
The thraot size will be 7 inches.
Yes I have thought about paying someone else to do the work, but that sort of skilled labor is super expensive around here.
And... Yesterday I had a sort of "big day" with regard to defining the process. I'm still working it out, but it may not involve breathing chemicals, and could be quite simple.
On another subject : I'm considering having all drivers remagnetized via a local guy who used to deal with Vitavox (and other) drivers. He stopped offering the service a long time ago, but still has the equipment, which is large enough to take the AK151s complete with their baskets. The process necessitates removal of the diaphragm/coil assemblies of all drivers (no problem; centering the coil in the AK151s is simple, and I've done the others often enough)
I asked him how he knew when to stop the process... He said that he stops when the magnet is fully saturated, which is what I would have guessed. Still, it makes me nervous; I will let him start off with a back-up set of drivers.
Regarding Vitavox bass drivers:
The only difference I can see between the K15/40 and the AK151 lies in the resistance of the coil; the K15/40 being wound for 15 Ohms R, and the AK151 for 7 Ohms R. (In fact, the cone replacement kit one installed would allow him to change between the two drivers).
According to the spec sheet, the K15/40 was intended to be used as a direct radiator. The AK151 was intended to be horn-loaded.
Vitavox's resoning here must have bene that once loaded into a horn, the impedance in the case of the AK151 would come up. (Impedance at 400Hz for the K15/40 is 15 Ohms. Impedance at 400Hz for the AK151 is "determined by the charastics of the associated horn")
jd*
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