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I need the external diameter of the voice coil & of voice former. Thanks.
Follow Ups:
Thanks for the help.I was thinking of turning my PM4 magnets into colossal domed tweeters by sticking a compression driver diaphragm on! haha.
I can't remember where, but I read somewhere about someone who cut the main cone away from the cone assembly of a Lowther driver and modified the whole thing to work as a tweeter. They reported being pleased with the results. You could do something like that, I'm sure. There are those who would argue that what I just described would be better than any dome tweeter you could make using the same driver. (Some people are dead-set against dome tweeters.)
The only cones I have right now are good ones and I'm not about to butcher those.Actually, my first idea was to turn the thing into a compresson driver!
I know someone who used a Lowther as a compression driver for a bass horn that he built out of concrete in his basement. The cone had to be reinforced to prevent it from collapsing. He got down to 16Hz with it. It was good but too long and he was bothered by the time delay. In the end he shortened the horn (NOT a fun activity with a concrete horn!) and replaced the Lowther with a 15-inch Altec woofer, which (surprise!) gave better results in every way.
I'm certainly not going to be that crazy!! With a 1.5" voice coil, I think a mid range application would be best. Maybe I could invert a small format Altec diaphragm, glue it to a Lowther voice coil and also use the phase plug .... Hmmm.... Machining a housing to take the lot shouldn't be to hard. Hmmmm....
I'm certainly not going to be that crazy!! With a 1.5" voice coil, I think a mid range application would be best. Maybe I could invert a small format Altec diaphragm, glue it to a Lowther voice coil and also use the phase plug .... Hmmm.... Machining a housing to take the lot shouldn't be to hard. Hmmmm....
Lowther coils are wound with an interstitial former, i.e. one layer is internal and the other is external to the former. I have two old cones of different vintage and models. My calipers say that the radial width of the coil with the longer former and gold insulation is 0.017" and the one with the shorter former and pink insulation is 0.020".ID and OD is too difficult to measure because both the coils are out of round. I measure the ID of the former at close to 1.531" or 1-33/64" but this is not a reliable dimension. To get the proper coil dimensions, the magnetic gap diameters need to be measured. Why do you need these dimensions? Is it worth my trouble to arrive at the correct specifications?
Oops! 1.531" = 1-17/32".
The link takes you to the Lowther website spec page. If you need information not found in the specs, you can probably get it by clicking on the email link in the page.
http://www.lowtherloudspeakers.co.uk/a-series.html
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