Unfortunately this seems a common problem - one of the midranges on my MS150.2s started making odd noises a couple of years back and it turned out that my voice coil had fallen off the former, too.

Luckily at the time I was able to buy a replacement from Martin's Beoparts website. Now my second midrange is making ominous noises and I'm not sure I'll be so lucky again.

Maybe we should go halves on a scrap pair of speakers with good midrange drivers if either of us finds some!

I hope you didn't throw the faulty midrange drivers away.  There should be some specialty speaker repair shops that can rebuild them.

Upon purchase (sight unseen), the good speaker had an occasional rattle in the mid range, which I chose to ignore. Now that I know what it is, when I pull it apart to recap, I'll glue down the coil as well. 

A set of parts S80s appeared on ebay last week, and went for about $50 - what a shame they aren't the same mid ranges!

The thought of repair did occur to me, but it is also the fact of that which has prevented me from having a go myself. I have managed to locate the break in the coil, and slip the coil back onto the dome. Would a repairer bridge the break, or rewind it?

Can you post pictures of what you are describing?

link

I had a similar break on the midrange of one of my MS150 speakers. That midrange is slightly different in its assembly though. You can see my break and repair

Yes, the break in yours seemed to be in a place much easier to deal with. Were you able to solder directly onto the winding or did you have to strip off the red coating? When I split it (having found it to be open circuit, so what is there to lose?), the coil was hanging off. I eased it back on loosely while I tried to find the other end of the broken wire. I don't know how essential that the loops are in perfect alignment. 

I carefully stripped off some of the insulation where I did the soldering. The solder joint didn't turn out as clean as I wanted but it has held and worked fine for several years now. I think the wire symmetry would be important but I'm not expert in speaker coils.  That's why I would suggest using a professional speaker repair shop for this.

If these speakers were readily available then it might be fun to try a repair yourself. Unfortunately these are no longer made so you have to be more careful.

I took the speaker in to a repairer who said there was no hope. I asked him to solder it up anyway and that I'd have a go gluing down the coil. It works, but rubs. 

I am thinking of broadening the search - do you know what the specs are for the H287? Max power handling, range, etc?

Thank you.