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Multi-Way Conventional loudspeakers with crossovers

New guy needs help with Sansui SP-200 speakers
New guy needs help with Sansui SP-200 speakers
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Old 2nd July 2017, 04:57 PM   #11
picowallspeaker is offline picowallspeaker  Italy
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Eh eh we don't care, do we ?
We are interested in the acoustic side of the thing, the sound....
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Old 2nd July 2017, 05:48 PM   #12
system7 is offline system7  United Kingdom
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Alnico drivers! Legends. Probably high Qms too.

I believe they lose sensitivity over the years. The magnets need recharging.
Attached Images
File Type: jpg Alnico SP-200 sealed back midrange.JPG (33.9 KB, 28 views)
File Type: jpg Sansui SP-200 Alnico.JPG (46.7 KB, 28 views)
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Old 2nd July 2017, 06:16 PM   #13
system7 is offline system7  United Kingdom
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Let's hope the woofers work. Here's a good tip for old rubber-roll surround basses. A layer of silicone grease loosens them up and protects them.

Click the image to open in full size.

Now the silicone aerosol isn't the best thing to do this with directly, because they also contain a solvent or propellant like trichloroethane or butane, which might dissolve glue. So spray the grease onto a tissue, and let the solvent evaporate in a well-aired room, since these things tend to be unhealthy to breathe.

Now rub the tissue onto the surround. Comes up shiny and nice and black, like those valeting car sprays for plastic surfaces. This does not apply to impregnated corrugated cloth-surround mids or basses, which just seemingly go on forever. Originally cloth-surrounds were made with a toluene based lacquer, but this is considered cancerous these days. Old lead solder used in old speakers has a similarly dubious reputation in the modern day.

I find surgical spirit on a tissue rather good to polish up old cabinets. Lifts off the dirt too.
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File Type: jpg Monitor_Audio_Silicone_Grease.jpg (88.5 KB, 26 views)
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Last edited by system7; 2nd July 2017 at 06:35 PM.
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