DKAudio wrote:

I checked one and it is fine!  Got a clean reading of 6.8 ohms, huge relief, I’m sure the other one is fine too.  I also checked the crossover’s traces for continuity and all is good.  At this point I wonder if I should just purchase the capacitor kit and replace all the capacitors.  I would have to unsolder them from the circuit to check capacitance anyways.  I’m sure the resistors and inductors are fine (don’t have an inductance meter).  I could check them to make sure they aren’t open though.

Don't assume anything, check the components. Just about the only way a component fault in the crossover would silence a driver would be an open circuit, and capacitors very rarely do that. A burned resistor is more likely.

EDIT: just checked the schematic, and as far as I can see the only fault that would completely silence the bigger midrange (and only that) would be an open circuit in L2, or just an old fashioned connection problem (cracked soldering or something).

I checked all traces on the circuit board.  I will look for cold solder joints and will check the resistors and inductors.

It's odd that both cabinets are doing it.

Thanks

Probably burned coils then.
They can still conduct current but will have expanded physically due to heat and then start to bind.
Check those crossovers again.

Please clarify if your speakers are Beovox MS150 or MS150.2
(Title says one thing, your first post another).
The midrange drivers are not identical.

Martin

They are the MS150's.  The dome is clear, not black like the 150.2's had.

hmm is it possible the coils have become detached? I had this problem with my s120's but they did produce sound, just distorted... They are easy to take apart but very delicate - don't think you have a lot to lose!

They are easy to disassemble?  Does the magnet bolt onto the frame or something?  If they are easy to take apart and it is just a loose voice coil then they should be able to be fixed.  Do you have a basic procedure to disassemble?

Did a similar repair to my pair of MS150 (refoaming) and thought they are done now.

When reassambling I was not sure if the tube needs to be screwed down with the metal pieces or if the tube just sits loose on the midrange unit so I went for the second option.

Could somebody clarify this please..

Hi yes if I remember they have 3 plastic clips (very delicate) and you must remove from magnet assembly very carefully! I am sure Martin could possibly give you guidance...

I have got some photos which I will happily post BUT on Friday my 1 month old Samsung hard drive completely stopped working and I cannot access the PATA drives on my main machine. until a new drive arrives I am stuck. First time with Samsung and I am NOT a happy customer :(

Been gone for the week on vacation!

Sorry to hear about the mids...🙁 Hopefully, you can find some good ones. Or save up and get those reconed too, I guess.

It sucks that the previous owners didn't take good care of these fine speakers! Now you're having to pay for it.

Jon