Hello everyone. I will share to everyone my simple experience with vw lupo and crossovers for speakers. \\
Total work for me - about 4 hours, I guess it is possible to install crossovers within 2 hours if you know where to put them.
I have very poorly equipped vw lupo, with just 4 speakers - two mid range speakers in doors and two tweeters in front panel. I use a radio with pioneer mosfet 50w x4 head unit. All the time tweeters tries to sound as loud as possible and mid range spekers starts to work only after the tweeters reach their limits already. For this reason I was shure I need to install crossovers.
I found the left door and left tweeter wires slpitting in air vent, however I needed to disassemble half of the front panel, you can try to do all the wiring just by gently pulling out the left air vent, by just taking off the thick insulating tape from the wires. As you can see in picture with wires, speaker wiring in vw lupo is very simple, they just made an u-turn in mid range speaker wire for tweeter and added tweeter wire in the end, this results in the effect, that tweeters and mid range speakers gets the same intensity of music output power from the radio.
The left side is actually more easy, you can just cut the wires, clean a bit of insulation material from the ends of all 6 wires, and just connect the crossover. I simply screwed the crossover in the blank space in the bottom of the picture, the left air vent goes above, however I removed top covers to both of these crossovers because of limited space. I can add photo of results if anyone will be interested.
The right crossover was more complicated, first you need to remove the headlight switch (turn switch to off possition, press the switch in and turn it clockwise), then you will be able to unscrew a hex bolt, after that just gently pull out the right vent hose. I also removed instrument cluster to make acess to wires more easy, because in the right side you will need to solder some extensions to wires. I screwed the tweeter as you can see in picture, as I said - didnt use the top cover of the crossover because of limited space. Everything goes in the place without any extra transfromations.
OEM speakers are not high end, and radio needs to be turned louder after this modification, but the speakers sounds briliantly and thats fine for this car.
