Spent most of the day working on installing a pair of 6.5" Alpine 17C2 speakers in the front doors of my 2000 C230, using JCE's excellent write-up and this post at Club202 for inspiration.

Instead of modifying the stock speaker mounts, I bought a pair of Autoleads SAK-2001 front door speaker adapters, which are supposed to allow mounting of 6.5" speakers in the stock space. They're available from retailers in the UK for about $40 or so, shipped). Unfortunately, unlike the poster on Club202 who used them successfully with a pair of Boston coaxials, I ran into a few problems with mine:

1. The magnet on the speakers interfered with the sheet metal frame of the door, making it impossible to line up all three mounting holes with the adapter screw holes.

2. Two of the adapter screw holes have plastic columns behind them that raise the adapter off the sheet metal. I had to take about 1/4" off each of them to allow the new speaker + mount to fit underneath the door panel.

3. The adapter screw holes are tapered and non-threaded. Although the kit comes with self-tapping screws, they're too long for the application and don't go all the way through. The best solution would be to drill out the screw holes, but I didn't have my drill with me and so I used the self-tapping screws to ream out the holes, then finished up with the shorter mounting screws supplied with my new speakers.

Anyways, on with the pictures:



Here's a picture of what you get with the adapter kit, along with one of the stock speakers for comparison.



Stock on the left, adapter on the right. Note that the bracket is asymmetrical.

On to the install:



There is one screw on the bottom securing the speaker cover, then pry the rear of the cover down and towards you, before sliding it forward.



The tabs on the cover preventing you from just pulling it out.



The stock speaker is secured by three screws.



Now here is where you decide whether to take the door panel off or not. The instructions say to remove the door panel, in order to unplug the speaker wires and remove the rear dust/water cover. If you don't want to take the door panel off, then keep reading.

Cut the speaker wires at the speaker terminals, then pull the wires through the stock bracket.



Next, remove the dust cover by releasing it from the waterproofing sheet, then pulling it off the door. Note that the cover is secured by clips into the metal door frame, so it will take a little tugging. Also note that although the waterproofing sheet stretches, it doesn't stretch enough. I made a cut below the lower front mounting hole with some scissors that let me pull the cover through, then I fixed it with some duct tape.



Everything out.



The back of the dust cover. It does look like it keeps water off the back of the speaker - I thought about fabricating something similar for my new speakers, but I didn't have any materials, and I was running into fit problems with the door frame, so I ended up not replacing it with anything.(*)