Yes I have. Thanks for the link. I can find foam rings for the woofers, but what about the other unit, which needs refoaming. It's the unit just above the woofer. I thought it was the mid-range but is it really the phase-link instead? The specifications on the M75 says:

Woofer: 25cm
Phase link unit: 12,5 cm
Mid-range unit: 6cm
Tweeter: 2,5cm

When I measure the units none of them is 12,5 cm. The closest is 11,5 cm, which is the unit just above the woofer...

I think there must either be a discrepancy in the specification, or there were different versions of the M75 with a 12.5cm unit.

Mine also measure smaller. I refoamed mine with a 4.5" foam surround modified to fit. I cant remember where I got the surrounds for the M75, but i've used link and in the past on other speakers with good results.

 Your cabinets look great BTW!

 and in the past on other speakers with good results.

 Your cabinets look great BTW!

What did you have to do with the 4.5" to make it fit? How did you solve the problem with centering the cone? Did you use shims?

www.goodhifi.com is also a good source of foam surrounds. I have used them a couple of times. The website looks a bit dodgy, but they are very helpful with finding the correct size for your unit and they ship fast. 

The tweeter and midrange drivers are both dome's. The filler and woofer are cones. The same filler is used in Beovox M100 and M100-2.

Martin

Can't really say I know much at all about these speakers, but the midrange units look very similar to the classic PMC design (copied by ATC), often considered to be one of the best midrange units designed (they cost in the order of £300+ now I believe).

Bit of an understatement jgunzelman!!!!!!!  Absolutely amazing - I would never have thought it was possible.

riis - Is it possible to give us a step by step description on how you did it and what materials you used ?

Cheers

Nigel

I modified the surround by slicing a section out of it, and glueing it back together, creating the correct diameter. This was about 10 years ago, and not many different sizes of surround were easily available back then. Maybe you can find one that fits perfectly these days.

 I shimmed the woofer and 'phase link' units, but if i was doing it again, I probably wouldnt bother shimming the smaller driver. I've refoamed several small speakers since without shims with no problems. The smaller drivers with a light cone seem to self centre quite well.

I still shim large drivers though, they have a tendancy for the cone to rock when there is no surround to support them.

Maybe the size of the phase link units are measured differently because of the shape of their chassis'. I remember the surround was just slightly over 4"

Ben