I have inherited a small collection of drivers. Among them are a pair of Scanspeak 7"-ish 185/8535. Both drivers have open voice coils. Is there a place to obtain parts to rebuild these? Or is there a reliable rebuild service? I have heard these in a multi-way system and they are easy to listen to.
Yes. Exactly those. https://www.madisoundspeakerstore.c...ic-18w/8535-00-7-mid-woofer-for-sealed-boxes/
The drivers that I have are circa 1998 and may be early prototypes. The magnet assemblies are machined whereas the new units on Madisound have stamped pole pieces.
The drivers that I have are circa 1998 and may be early prototypes. The magnet assemblies are machined whereas the new units on Madisound have stamped pole pieces.
That's 18S/8535 surely? Is that a shielding can on the magnet? Odd to have those little plastic plugs in the screw holes if they've been used.
They were used in an educational/R&D environment. Hence the blown voice coils. Yes probably 18S. Hand written and easily mistaken S for 5
Mystery solved. Obsolete version. I still want to know if there is a repair shop that specializes in ScanSpeak rebuilding.
It's possible that they don't have blown coils but that they've suffered from corrosion at the point where the tinsel leads solder to the voice coil on the backside of the cone.
There have been reports of the epoxy used, and placed over the solder, here slowly corroding the solder join.
You'd need to scrape it away, find bare/fresh metal from the voice coil and try probing to see if you've got resistance.
There have been reports of the epoxy used, and placed over the solder, here slowly corroding the solder join.
You'd need to scrape it away, find bare/fresh metal from the voice coil and try probing to see if you've got resistance.
"You'd need to scrape it away, find bare/fresh metal from the voice coil and try probing to see if you've got resistance."
Thanks, I will give that a try. Can not make it worse. Great idea.
Thanks, I will give that a try. Can not make it worse. Great idea.
Hi - I had to do exactly as has been advised to a pair of 18W 8542 of the same vintage (7") this was over a year ago and still working - scraping away the adhesive needs care and re- soldering was not easy as the coils are possibly aluminium, but still going? You may need a more suitable flux based solder than normally used.
See this thread. It may be difficult to see it as clearly with a black cone, but in a 18W/8546 I repaired recently, it looked exactly like that, an obvious blackening under the translucent glue, which in my case looked and felt remarkably like contact glue. I'd try to see if that could be the problem here, I agree with 5th element's advice too.
Edit: Scan-Speak still have the 18S/8535 datasheet in their webpage. It seems it's the shielded version of the 18W.
Edit: Scan-Speak still have the 18S/8535 datasheet in their webpage. It seems it's the shielded version of the 18W.
Orban Audio repaired two SS woofers with the failed leads/coils for me with very good results.
Another good thread here.
Another good thread here.