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Could be one of the speakers Bowers and Wilkins made in their humble beginnings.
B&W labels on the back with the model being marked as "M1" though it seems that it's been scratched into it rather than stamped like the serial number below it.
Judging by the huge aluminium capacitors in the crossover they could be early 60's.
Elliptical EMI paper cone main driver and two Celestion T692 tweeters of which I found nothing about online. By the looks of it the tweeters seem to be AlNiCo.
Cabinet made of three-ply lumber core panels. No padding inside, no seals on the back panel or around the drivers.
The screws that were holding the tweeters in place were different from one speaker box to the other and so was the wiring even though the speakers are consecutive serial numbers 564/1003 and 564/1004. They might have run out of screws and wire?!?
Also found a random screw dangling about in one of the boxes that was left in there accidentally as it was identical to the ones used in the crossover boards but there were none missing. Really?!? C'mon B&W . . quality control?!?
The inductors are shielded in what looks like ferrite but one is cracked.
The wire leaves the box through a hole at the bottom.
Sound wise they're rather lovely.
Even though the cabs they came in are about the size of DM3 (665x300x250mm / 26x12x10inch) I think they would fit well in a cab the size of B&W DM4 or some Radford Bookshelf?!? I don't have any experience with these EMI eliptical drivers. Are these meant to be used in a sealed box or open baffle?
I'm thinking of refreshing the crossovers and probably changing the inductors since one is cracked and move everything in a proper cabinet or fit them on two slabs of wood as an open baffle design? Can the EMI drivers be used in an open baffle design?
I've put up two videos on youtube. The second one is clearer.
1 - https://youtu.be/ahQXbxaVNY0
2 - https://youtu.be/gwdvgDmequU