Looking at my picture archive, two of my MS150's have Orange (+) and Yellow (-) for the smaller woofer (midrange 1 ).  My earlier MS150 has White (+) and Gray (-) for the midrange 1.

-sonavor

At the request of another Beoworld member, I dug out one of my remaining MS150 speaker cabinets and recorded the dimensions to use as a reference on some MS150 cabinets he suspects were modified.

Here you go...

and...

Here is the last set of measurements.

Hi guys,

thanks for this topic, now I want Beovox 150 🙂

It has been a while since I have done any work on my MS150 speaker sets. I still have the third pair to restore but it is low priority. I do listen to at least one pair of the MS150 speakers every day. One is connected as part of a complete 8000 system. The other is connected to a vintage Sansui AU-9500 integrated amplifier. The speakers sound great with both.

One thing I have yet to do on all of the sets is to re-cloth the grills. Also, one pair did not have a complete set of grill covers. This time, last year, Beoworld member Steffen was generous and provided me with a set of MS150 grills so I could complete my last pair. I was so busy with Beogram turntable projects that I couldn't get around to restoring that last pair. Hopefully I can remedy that here soon.

I did want to take a look at the MS150 grill cloths and frets regarding the task of re-covering them. The grill covers are plastic with thin, metal trim that presses the cloth into slots in the edges of the plastic frame. The metal trim looks continuous but there is a break where they can be removed.

Start at the break that is already there in the metal trim.

From the break in the metal trim, you can carefully pry the trim away from the plastic frame. Do it slowly and a little bit at a time.

Don't open up one end and continue around until you pull it off the other end. That will likely cause an unwanted break at the corners.

Instead, only open up one side enough to start prying the next side up.

Continue prying just enough of the trim out as you continue all around the frame. Eventually there will be enough clearance to remove the trim completely while having it all intact.

Looking forward to seeing your method of attaching the cloth to the frets!

Cheers

Nigel