Teufel Ul 20 Mk2 scratchy speakers but bass is okay, is it the amplifier or are the speakers defective?
I've finally tested these Teufel speakers after a long time and noticed the scratching when playing music and I'm wondering why? What could be the cause?
This can be caused by a deformation of Coil lie.
This is what happens when you completely overload the speaker:
Tip:
Once carefully press the membrane when it is “short/cracked”, the loudspeaker (=swing coil) is broken. Here at YouTube well explained:
https://youtu.be/wHzvzlhcNts?si=Ikt7o_JH3ParJqES
Good luck!