Hans,you could pull the suspecting tweeter and place it in the other speaker.If the poor sound follows then you have a bad tweeter.If not then maybe the crossover is the culprit or maybe your cables,equip.
Tweeter damage
Anyone heard damaged tweteers? Do they go lika a fuse, i.e. either they work or are totally corupt? Or can they just be slightly damaged? I send a Dolby Digital signal through analog pre-amp...A VERY unpleasent experience! Read that it could damage my ears as well as my speakers... Grateful for any info! Hans -Sweden (Hence my English)