Dont sand it like they do.
If any polishing use Scotchbrite or similar that does not remove material. Those reliefs have a design function, and should not be altered.
I just meant the vid. As a visual for the cleanup of corrosion and the VC gap.
I will reply to the rest when i have energy. Just drove 1300 kms.
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A few more photos of the corrosion/residue on the JBL 2450H's.
I was wondering if anyone had any tips for cleaning, particularly the parts that creep into the voice coil gap.
Is that best left alone - or is there a way to safely clean in there? Some seem to say don't put anything down except for the card and tape trick, while others seem happy to flush it out with some deoxidation spray / compressed air.
I don't see any noticeable pitting, it seems to just be a residue on the surface, so hopefully these can come good.
I saw that trick on a few youtube channels of running a test tone out of the headphone jack of a phone/laptop. I thought there was no harm in giving it a try with one of the beaten up old diaphragms which will soon be replaced - it seems to play cleanly (to my ears) once manoeuvred into position.
I was wondering if anyone had any tips for cleaning, particularly the parts that creep into the voice coil gap.
Is that best left alone - or is there a way to safely clean in there? Some seem to say don't put anything down except for the card and tape trick, while others seem happy to flush it out with some deoxidation spray / compressed air.
I don't see any noticeable pitting, it seems to just be a residue on the surface, so hopefully these can come good.
I saw that trick on a few youtube channels of running a test tone out of the headphone jack of a phone/laptop. I thought there was no harm in giving it a try with one of the beaten up old diaphragms which will soon be replaced - it seems to play cleanly (to my ears) once manoeuvred into position.
These are what I use to clean gaps that are fuzzy as you show.
These are very mildly abrasive, flexible and strong. I break them in on another surface and they will rub off the fuzz and not go through the zinc coating.
I am a nut with compression drivers and have made gage fixtures to measure the installed height of the phase plugs and coinciding depth of the diaphragms and built a plane wave tube for assembly validation.
I have measured improvement in frequency response smoothness when fuzzy gaps are cleaned flat and square and remeasured. A paper card may or may not get these truly clean.
Compressed air is also your friend. Keep taping and blowing them out until there is nothing at all coming out.
Barry.
These are very mildly abrasive, flexible and strong. I break them in on another surface and they will rub off the fuzz and not go through the zinc coating.
I am a nut with compression drivers and have made gage fixtures to measure the installed height of the phase plugs and coinciding depth of the diaphragms and built a plane wave tube for assembly validation.
I have measured improvement in frequency response smoothness when fuzzy gaps are cleaned flat and square and remeasured. A paper card may or may not get these truly clean.
Compressed air is also your friend. Keep taping and blowing them out until there is nothing at all coming out.
Barry.
