Acid corrosion on RS woofer magnets?
cnh
Posts: 13,284
OK,
I have some free time here and a few things I want to address. A while back (quite a while). I was given 2 pairs of RS Nova 8s. Was thinking of putting together an old Ratshack vintage system. Figured with 4 speakers I ought to be able to salvage two.
Today I started going through them. First just listening. One pair is a little newer than the other.
On the newer pair. The negative lead was broken on the 11" woofer (soldering should fix that). There is an abundance of red fiberglass fill in these cabinets....A LOT!
Something that I've NEVER seen but I'm sure many of you have? Was some corrosion around the iron magnet ring, a little rust and a lot of white powdery substance--like what we used to see build up on car batteries--I'm assuming some kind of acid).
One speaker is worse than the other. But that does not seem to be affecting performance.
I open up the OLDER speakers and NO corrosion of that kind? Huh! Was this some weird storage issue? On the older speakers one of the woofers is rubbing, so it does not move freely, hence puts out less bass. The RS surrounds are permanent sticky inverted fabric ones that do not need to be replaced so I don't want to mess with that. I figure I'll use whichever woofers are not rubbing.
The fabric surround is deformed (wrinkled) where it is rubbing.
I figure with four of these I can even fool around with the crossovers as a learning experience since I can afford to mess one or even two up! They have knobs for the mids and the tweeter on the back (2.500 hz and above 5Khz).
The real question here is WHAT is this WHITE powdery substance on those woofers and HOW did it get there. These are "sealed" cabinets? And what do I do about it? treat it like battery acid with a toothbrush, coke and some sanding then paint? Or?
Thanks.
cnh
I have some free time here and a few things I want to address. A while back (quite a while). I was given 2 pairs of RS Nova 8s. Was thinking of putting together an old Ratshack vintage system. Figured with 4 speakers I ought to be able to salvage two.
Today I started going through them. First just listening. One pair is a little newer than the other.
On the newer pair. The negative lead was broken on the 11" woofer (soldering should fix that). There is an abundance of red fiberglass fill in these cabinets....A LOT!
Something that I've NEVER seen but I'm sure many of you have? Was some corrosion around the iron magnet ring, a little rust and a lot of white powdery substance--like what we used to see build up on car batteries--I'm assuming some kind of acid).
One speaker is worse than the other. But that does not seem to be affecting performance.
I open up the OLDER speakers and NO corrosion of that kind? Huh! Was this some weird storage issue? On the older speakers one of the woofers is rubbing, so it does not move freely, hence puts out less bass. The RS surrounds are permanent sticky inverted fabric ones that do not need to be replaced so I don't want to mess with that. I figure I'll use whichever woofers are not rubbing.
The fabric surround is deformed (wrinkled) where it is rubbing.
I figure with four of these I can even fool around with the crossovers as a learning experience since I can afford to mess one or even two up! They have knobs for the mids and the tweeter on the back (2.500 hz and above 5Khz).
The real question here is WHAT is this WHITE powdery substance on those woofers and HOW did it get there. These are "sealed" cabinets? And what do I do about it? treat it like battery acid with a toothbrush, coke and some sanding then paint? Or?
Thanks.
cnh
Currently orbiting Bowie's Blackstar.!
Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
[sig. changed on a monthly basis as I rotate in and out of my stash]
Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
[sig. changed on a monthly basis as I rotate in and out of my stash]