Installing 9-5 door speakers into the C900
Cutting wheel or sawzall to make a hole in the door.
Long knife or a sideways cutting drill bit for cutting the door panel.
Drill and drill bits.
The stock speaker locations for the C900 leaves a lot to be desired.
Even with a decent subwoofer, you end up with a big gap in the mid-range. There is only one solution to fix this problem. You need a bigger speaker up front!
Pretty much every car with a decent car stereo will have 6.5" speakers in the doors and they only produce mid-range sound.
The tweeters are located higher up and usually facing the driver.
To solve this mid-range problem, most people will suggest you build a kickbox and put it in the footwell pointing to toward the driver. I don't consider this a good option for two reasons.
First, you have to move the fuel injection computer to create space on the one side. Second, the footwell is already narrow and I don't want to keep kicking the speakers.
My solution came to me after replacing the speakers in my 9-5. I bought some used door speaker mounts from Goldwing and dedicated one weekend to making them fit into the doors.
I'm happy to say that this is a perfect solution to the mid-range problem. They sound and look great. In fact, unless you are looking you probably won't even notice they are there.
This guide will help you install these into your C900.
Used 9-5 speaker mounts.
1 - 1.5" long 8mm hex bolts and nuts.
1 package of 1/2" insulation tape
Some small tubing to act like a spacer
Decent 6.5" speakers.