This is DIY install of tweeters for a BMW E60/E61 5 Series. Mine is a 06 plate 520d but the approach will be almost identical for all E60/E61 variants.
The base spec E60/E61 does not come with tweeters as standard, however the grill and aperture for the speakers is there and there is a connector on the mid-range speaker in the doors for the tweeter. It is however not a standard connector and a bespoke BMW connector.
You can buy the actual BMW tweeters to install with the correct connector but these cost around £60 even on e-Bay and probably even more from BMW. So I decided to buy some reasonable quality tweeters from Halfords which were Vibe BlackAir 25mm tweeters for about £25. The reality is any 25mm tweeters are likely to fit.
I then bought the correct connector from BMW which consists of the connector and 2 flying leads. The high level BMW part number is 61136925634 but this will also come with the flying leads (61130005197 and 61130006663) and covering cap (61138352588) which they should provide if you ask for the first part number. The total cost for all parts for both sides was £7.70 from BMW.
I then simply soldered the BMW connector onto the Vibe BlackAir tweeter flying lead.
OK so now the tweeters are prepared it was time for the install. Below is a photo of the inner door of the car.
There are 2 screws to undo, the first is next to the top hinge which is a cross head screw.
The second is hidden behind the plastic AirBag logo. Just prise the plastic logo out gently with a flat screwdriver to reveal the trox screw.
Once both of these screws are removed then it is a case of gently prising the door card away from the door. I used a metal ruler but a wallpaper scraper or similar would also work. Just be careful not to scratch the paint. I found that pulling towards you works best.
This bit almost feel like you are about to break the door but hold your nerve, you should hear a series of popping sounds as you work round the door which is releasing the white bullet type connectors. Once you have a few released you can then get your hands in and gently pull instead of using the ruler.
Once complete the whole door card shold ease away from the door. You have to lift it up the whole door card to disengage the top part and to lift over the door lock indicator at the top. Lay the door card gently on the ground, you may need to rest it on a stool or unplug some of the connectors to avoid strain on the connectors. now to the tweeter surround itself.
The tweeter surround is held in place by the weather seal around the door, so gently ease this back and the plastic surround should come away from the door to reveal the aperture for the tweeter behind.
If you are using the OEM BMW tweeters then they simply click in place, however if like me you are using a generic tweeter you can use some duck tape just to hold the tweeter in place. Once in place on the door the foam surround and plastic grill hold the tweeter quite firmly anyway. Then re-fix the tweeter surround back in place with the door weather seal and run the tweeter cable along the existing cable run as detailed below, using a bit of electrical tape to hold it in place.
The tweeter connector should then simply click into the spare socket on the back on the midrange speaker as shown below.
It is then a case of reversing the removal of the door card, starting with hooking the door over the door lock indicator and fixing the top of the door. Then work you way round the door card clicking into place the white bullets, making sure that non of them fall out. You might have to thump the door card quite hard to make them click correctly.
Now turn on your stereo and enjoy the improved sound! You will have to play around with the treble controls to get the right balance.