Wonderful classic system !

Probably a lose winding in the woofer coil but could be other things;
Take off the front grill, take out the woofer and inspect for eventual leads touching the
cone from behind. Push the cone in and out a little, gently, using your fingers and listen/feel
for scraping noises.

I may be able to find a good used original woofer if you need.

Martin

Hi Martin,

Thanks for your reply. I had another look, couldn't see any loose wiring (although if I'm honest I'm not 100% sure what to look for!) but I did notice the scraping noises you mentioned when pushing the cone in and out, a little like ripping sellotape off a carpet (?!). Any idea whether that can be salvaged?

Thanks,

Jack

Try the old trick of turning the woofer 180 degr and screw it back again.

I agree with Martin, it does sound like a coil winding fault which would be impossible to see but can be felt. I had these exact symptoms with a woofer on a different Beovox speaker. The fault was more noticable the less hard the speaker was driven. It was the binding tape on the coil which had "bubbled" causing it to rub as the cone moved. I had to totally disassemble the driver & sand off the tape back to its original shape/thickness. It was a real pain to do & I only attempted it as an exercise to see if it was possible. It was, but involved quite a bit of lateral thinking & searching my "man drawer" for suitable bits & pieces which could be adapted as tools for the job!

I wouldn't recommend it as a viable fix for your speakers as I'm sure it would make far more sense to take Martin up on his offer of a replacement driver or even buy another pair off ebay for what they cost. What I did is really not worth the effort on anything but the rarest speakers to be honest but was fun in a masochistic way

I doubt if it is anything wrong with the crossovers but this can be easily proved/disproved by swapping the drivers over & see if the fault follows the driver - which it probably will.

Chris.