Hi, Today I got my first rig ever, an Ashdown ABM 500 Evo III and the Ampeg SVT 410HLF. Apart from the fact that the tolex is getting loose here and there, the tweeter is making some noise when it is activated and a bass is played. As soon as the tweeter is off all is fine (via the controler on the rear side). The tweeter itself is working (checked that with a MP3 player connected to the amp), but it creates a constant grind or distortion as long as a tone rings. When I am directly in front of the 410HLF this noise can be clearly heard. A few meters away and it is really hard to recognize if at all. I read somewhere that sometimes horns do have problems with grinding sound signals. Is that correct? Is there anything else I could try? Will I have to return the cab to my dealer? THX!