IMF speakers and KEF B139 woofers

Richard (Vantageaudio) - thanks for your quick reponse. I believe the speakers were overdriven (not by me, by someone who was house-sitting for me). On one of the woofers, the voice coil is out of alignment, and at high (not excessively high) volumes, on certain low frequency notes (on some recordings), it can be heard rubbing against the magnet - rather ugly sounds, not musical at all!! I would like to replace both woofers if I can, but only one if that is all that can be foind. By the way, do you also get other replacement drivers for these speakers, such as midrange (KEF B110), and tweeters and supertweeters ?
thanks for your reply. Matt Bonn ([email protected])

Hello Matt. We send any drivers we need repairing to an associate company in the UK. They repair pretty much anything speaker related. I can ask them Monday about your specific problem. As far as replacement drivers go we search around our contacts when we need them and have found the B139 and B110 units are out there. Tweeters like the T27 have become very scarce although some versions are available if one exercises patience. If you do repair your units I would recommend you have them repaired as a pair. Hope this helps you, regards, Richard.

Great speakers but easy to damage the woofers. My wife won't let me get rid of my IIIa's because she says they sound like home. They are still in her system in the master bedroom. If you repair them, the cross over is right behind the woofer and I would recommend that you replace the capacitors.

Pls1 - Thanks for your suggestion about replacing the capacitors in the x-over. Do you know where I can get information on the capacitor values and recommended brands to use ? Thanks, [email protected]

If you replace the capacitors be careful about replacing them with any later, fancy types. The tendency these days is to replace older vintage types with modern capacitor types that are "faster" and able to pass higher energy peaks thru to the tweeter and thus cause damage to the tweeter. Many times we know of people who have replaced their caps with polyprop types and a few weeks later ask why their "...tweets have fried..."!! You should be able to read the brand and value off of the existing one and try and source NOS or equivalent replacement. I've emailed you some info on the B139's. Regards, Richard.