This was just posted yesterday in the other forum - re-posted here in case those interested in swapping 4 inch drivers in rears doors didn't see . . .
So, here we go. The $64,000 question: can the rear 4-inch drivers be replaced and swapped out for Infinity reference 4022?
Yes they can. But there are some caveats. One of the door clips will not fit due to the protrusion of the much larger infinity magnet into a part of the door. Unless you're willing to grind that inner plastic structure on the door down with a grinding wheel to get an extra quarter inch of clearance you're going to have to live with that. However the two bottom clips that are critical to securing the door go in and every other one does so it's only one clip right next to the speaker that can't quite reach its socket.
Step one - take off the door with a Torx 30 and remove the pop in Clips carefully making sure to pull straight out or otherwise they will fracture. They take a lot of force to remove especially if this is the first time you've removed the rear door liner.
Step 2 - use a small drill bit to create a countersink hole on the three posts of the stock 4 inch driver. Then take a quarter inch drill and ream the entire plastic bolt attachment out, and the speaker should come out cleanly. Clean up around that because you're going to need all the clearance you can get and this leaves a certain amount of plastic debris in some cases protruding upwards. You can't afford to lose any clearance and the new driver has to fit completely flush on the grill. When you're using the drill be extremely careful that you do not puncture the outer door because otherwise you'll be buying a new one and they're expensive. So go light on the force when you're drilling out those 3 plastic bolts holding the stock driver.
Step 3 - I created a small pin like adapter that would plug into the stock harness (using sewing needles of all things!) but you will need very small pins because the openings in the stock harness are extremely small. Most speaker pins are way too big. I attached a 6in chunk of 16 gauge or 18 gauge wire with the two pins coming out to insert into the harness and then I taped the pen assembly to the harness so that it would not easily disconnect.
Step 4 - you're going to have to find a way to securely attach the driver on top of the old Grill. There's a bit of a tab protruding into the infinity tweeter and that again eats up precious space so I cut that out. It doesn't look like it does anything functional. I used Gorilla Glue in a glue gun and just gave me a very solid bond between the metal of the speaker basket and the plastic Grill structure in the door. I chose a glue gun because of the quick set up time otherwise you've got a basically have the door drawing for hours and hours.
Step 4 - reattach the door but do not expect the pop in clip nearest the speaker to fit. The only way I think that could be fit as if you grind down at least a quarter inch of the plastic sleeve which I think of some kind of polycarbonate. The speaker is going to sit flush against this so I put some kind of foam but not the foam that is already there because that's too thick. I used double sided 3M tape to reduce vibration and offer additional securing of components to one another. Make sure you've got positive to positive on your speakers and keep in mind that Tesla's color codes are a little bit funky. Sometimes blue is positive sometimes red is positive and sometimes even yellow or brown is positive. You can tell on the speaker harness because if you're looking at the speaker from the magnet side up, the positive is on the left side.
Step 5 - crank the volume up!!
If you've replaced the three front 4-inch drivers and the two rear I think you've reached a point of diminishing returns but of course if you're a total Gearhead and you have to replace everything then you got the two in the package shelf to do which I suspect are real Beast. I'm not going to do them. Famous last words.
Picture of pin adapter already posted here
Could you attach the photos here? I hate it when websites make you register to view attachments.
