I am NOT an expert at this. I am just regurgitating from a JBL brochure, but JBL recommends a xover of 3.5K with a 2nd order xover, ie 12db octave, rather than a 1st order for their 075/2405 tweeter. I would suspect that you could damage 075/2405 because it was not really designed to reproduce sound loudly below 3.5Khz