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Old 10-13-2008, 02:30 PM
BoostJunkie's Avatar
Boostaholics Anonymous
Join Date: May 2008
Location: Norfolk, VA
Posts: 91
Arrow 6X9 Speaker Project

Vehicle: 1982 300SD

Project: Rip out the back dash boxes and then make and install a custom speaker platform.

I bought a pair of Cerwin-Vega 6X9 speakers a few months ago from a friend. This weekend I decided to install them. I took so long because I had no idea where I was going to put them. I ended up removing the two back dash storage panels. (I removed the seat and seat back to get the old boxes out.

Then, I took a wee trip to Lowe's. T
here I purchased:
- A 5/8 sheet of fiberboard. 8 - 7/16 X 3" bolts.
- box of washers and a box of nuts.
- 4 feet of black indoor/outdoor carpet(way more than I needed).
- 4 metal straps used for framing.
- 1 can spray glue

Then, I went home and cut a 38" X 10" piece out of the fiber board. Then measured the holes where the boxes had been and then using the speaker grill holder I traced and then cut the speaker holes. A little tweaking was neccasary to get the speakers to fit just right.(It doesn't have to look pretty, it just has to hold the speaker flat.)

AS you can see I have already drilled four sets of holes spaced evenly at 7" apart to put the bolts through that will attach beneath the rear dash to hold the shelf in place. Be sure to measure and acount for the shelf so you don't end up having to drill through the deck.
Also, I rounded off the edges to match the curvature of the glass and panel so it looks more uniform.

Here are 2 pictures of the materials I used and most of the tools.

Then I used the spray glue and applied the indoor/outdoor carpet and finished up attaching it with staples on the underside.

Next, I cut out the speaker holes using a star type pattern and trimmed off the excess. Made inscisions for the machine screws and put them all in.

Last but not least, I put the new panel down in the back dash and crawled into the trunk to put on the straps. ( did have to drill holes in them to accommodate the bolts. Wasn't hard.) After bolting it down, I hooked the speaker wires up directly to the corresponding sides 4 1/2" speaker wire.

The finished product looks like this.

and it sounds even better than it looks. I'm considering not even putting a 10" subwoofer in now.

When doing this project, it helps if you have already bypassed the fader switch in the center console. Huge difference in volume and the sound quality IMHO.

I had a pretty good time making this and installing it. Now, I'm going to go take a nice drive in the country and enjoy my newly working sunroof and new stereo upgrade.

1987 MB 190E 2.3 16V- Name Pending
1982 MB 300SD -Old Blue
1965 Ford Mustang - Laura
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Old 10-13-2008, 03:37 PM
blackestate's Avatar
Registered User
Join Date: Aug 2005
Location: Washington State
Posts: 948
that is sweet!
83 300SD Dark Silver Dark brown inside
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Old 10-13-2008, 04:10 PM
winmutt's Avatar
85 300D 4spd+tow+h4
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,327
I need to redo the back of my dads 240. Unfortunately the deck that is there has completely disintegrated.
1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
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Old 10-13-2008, 04:47 PM
vstech's Avatar
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,208
is that kart diesel powered?
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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Old 10-13-2008, 06:00 PM
BoostJunkie's Avatar
Boostaholics Anonymous
Join Date: May 2008
Location: Norfolk, VA
Posts: 91
Originally Posted by vstech View Post
is that kart diesel powered?
Nope. We have three of them and they run on 110 Octane race fuel with a synthetic 2 cycle oil mixed in.

me and my room mate race in an amateur 100cc karting club. It's stupid fun!
1987 MB 190E 2.3 16V- Name Pending
1982 MB 300SD -Old Blue
1965 Ford Mustang - Laura
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