The one that is 18 Euros, it's a high pass filter, the crossover is in the radio itself when you have the sound upgrade (look for the screw in module on the top of the Smart's radio) the subs and the tweeters aer then fed off the front and rear channels seperatly. I think some of his leads combine the two, so you can run subs of the other channel, and the 85Euro one does tele mute functions.

He took ages to send mine though, and the postage was expensive if I remember right, but's it's alot cheaper then new tweeters from Smart, I heard about £150 a set, and the fitting is a removal of entire dash job

You will find most cool Smart stuff comes out of Germany. Personally I just want a cheap car to get around in that will hold it's value a little better than most others, I wouldn't go too over the top if I were you, boy racer Smarts don't sell well.

I ran in my own lomb from the battery for all my wiring, and used a relay from the ignition, I don't think the Smart's wiring is very robust, esp not for high drain devices

Cris.