Decided to replace the Becker stereo with a better sound system without jeopardizing too much of the Mercedes Character.
Here is the speaker plan.

DASH
Installed 4" MB Quartz speakers driven straight off the head.
Modified grille covers with 1/4" slices of 1 1/2"ABS pipe for tweeter room.
cut circles into grilles with a fine coping saw blade, used Gelled Super Glue to bond ABS rings to non ABS grilles.

REAR DECK
MB Quartz Onyx 6 x 9s Driven by 1500w amp.
In order to "flush mount" Holes were cut through metal deck , rear of speaker vented through a baffle box set in trunk area then returns through middle vent back into cab (not designed to thump the neighborhood only to improve base quality in cab area)

REAR SEAT SUB
MB Quartz MONO 10" square sub woofer
Internal seat was converted into a hidden vented baffle enclosure.
Removed arm rest for speaker space. (also not designed to thump the neighbors, but if I ever wanted to thump the neighbors I could just by rolling the windows down)
Driven by 2500w mono amp
Sub amp level control is mounted under custom made center console cover.

Attached Thumbnails

       

more pictures

Attached Thumbnails

       

Nice work! I can't make it out - do the pic tubes match the dash color?

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)

Thank you!
The tweeter rings cut from black ABS are a higher gloss than grill covers, so I just dulled them down with 320 and 600 sandpaper.

Attached Thumbnails