I would get the 6500 or preferably the 7000. You seem to have a lot of speakers! The only thing is the volume controls - I  wonder if you have MCL2Ps in the system.

Ok, I turned my house upside down trying to finally figure this system out, and just when I was about to lose hope, I found what I was searching for.  It had been hiding from me in the furnace room. 

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First two pictures are of transciever(amplifier?) that I found hiding.  I did not find the other two, but I am assuming they are hidden in the wall somewhere.  The 3rd pic is the volume dial.  4th pic is rectangular (transciever?) panel for beolink.  There are 3 of those in the house, which leads me to believe that there are 3 transciever boxes for a total of 16 speakers.  Took the speakers out of the wall, they are made by sonance.  Am I moving in the right direction?  I hope these extra pictures are a little help!

Thanks again for all of your insight!

The first find seems an MCL2something all right. It doesn't contain an amplifier, just some circuitry to send/receive remote commands from the transceiver (last pic) connected to it and pass them on to the main system, and a relay to switch on/off the local speakers connected to it. You must have two more of them somewhere as the IR transceivers alone have no use at all.

Can't make much of the volume control pic, but it definitely still is a custom job by somebody. Most probably just a passive attenuator so you can individually turn down the volume of those local speakers, otherwise they will all run at the same volume since the main system has just one shared output for all of them. It might also switch between some speakers, who knows.

But in any case, to me it seems safe for you to start looking for something to connect there 🙂

The white boxes hold the MCL circuitry that will switch on/off an individual (or several as they can be grouped) set of speakers and the last pictures shows the IR receiver that is connected to those boxes. 

These boxes need to be connected with the 3 pin plugs.

The volume control is just what it is ...switches on/off the speakers (hence the click sound) and dims the volume (just like a light dimmer).
Most likely connected to the 2 pin speaker plugs. It's kind of a limited manual control instead of the IR receiver/white box combo that also works with remote control.

As you have 4 plugs (speaker L and R and MCL L and R)  obviously they have several sets of speakers connected to both the speaker and MCL plugs.

So you still think the Beosystem is the way to go?

rhansen wrote:

So you still think the Beosystem is the way to go?

yes