I purchased a used Pure 2006 and the horn is anemic!
I told my brother (the person from whim I bought the car, so I had good advice on its history and operation) that the first thing I had to park when driving the Smart was my ego. However the horn is just too large a blow to the ego and not enough blow so as to be considered a passing wind at any speed. I found the horn I need and it is ordered but to my surprise I am spelunking this forum and am pleased with the wealth of useful information I am finding about the Smart and its foibles.
Looks like I may become a regular!

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