The front and the back of the cabinet are a very rigid plastic (seems the same as what I ran into with my S40 refurb project), and the sides, top and bottom are best described as "rough wood vinyl that is restorable."

I listened to a bit of music with them back at the house on the floor of my garage without any care to placement.  They sounded musical and ready to rock.  After verifying all the drivers were working (or rather, seemed to be working), I took them inside the house to open them up.

The best news so far:  rubber surrounds!

Rubber surrounds part 2!

The woofer cone seems a plastic of some sort, the same feel as Infinity woofers from the 80s.  Didn't seem like the polypropylene Vifa woofers I worked with a little in the 80s and 90s.

This phase link is a paper cone with rubber surround.

The infamous, gigantic dome midrange.

I am looking forward to taking a look under the hood of this tweeter. 

What's the story with this grill?  Is it aesthetic?  For dispersion?  Just to protect what's behind it?

If you're after the crossover, don't go through the woofer! 

The back of an M70 comes off by removing 8 screws in the back.

With the damping material removed, you can see a wooden brace, phase link subenclosure (which also serves as a brace since it butts up against the back of the cabinet), and the crossover network.

A closeup of the crossover network.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10 capacitors!

Here's the other crossover.  You can see they're different.

The serial numbers of the two speakers are quite different as well.  Both speakers have a label that says, "HT M70 Type 6304."  But the one from above has the serial number 174020.  The one whose crossover is pictured below has the serial number 1227022.

The only history I have for these speakers is that the nice guy I rescued them from never really used them, and he got them "from some guy out in the country."

To my eye, the wood vinyls of the two speakers are subtly different.  This difference did not show up in any of the pictures I took, though.

First up for these speakers will be some more listening - hooked up to the BM 2400 I think!  New caps are already ordered, and I think I'll try refinishing the cabinets for the first time.

I am not looking forward to rebuilding these crossovers, but I'm guessing it's got to be done.

Nice project !

The woofer was changed in production from s/n 1442001 and the tweeter can be one of two types.
The crossover is seen in several different versions accordingly, the capacitor kit you ordered, covers this.
One crossover seems to have been repaired (a couple of new caps) but otherwise they look identical.

You really should glue the magnet to the metal basket on the filler unit. It has a tendency to work lose,
especially in transport, and then the center piece and magnet will snap to one side, sandwiching the coil
and blocking the cone.
A bit of 2-comp. epoxy on the magnet edge where it meets with the metal chassis will help keep it alive.

Same problem is seen in the Beovox P45 speakers, where the woofers are of the same build as
the M70 filler (though not with identical specs).

Martin