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Thank you all for your suggestions! A combination of them all (over a period of time!) worked for me.

Now to get these things sorted. I'll open a fresh thread showing my progress.

Thanks,
...

Hi All,

I've just acquired a pair of VERY poorly JBL 4411 monitors that I have decided to put the effort into (pics to follow).

I learnt from the previous owner that he'd been running them...