The problem is noise. K-horns are very (too darn) efficient. Try reducing the gain of the amp. Any tech can show you how to insert a volume control in the line. (Go to radio shack and buy a METAL box, RCA plugs, a 100K stereo volume control, and build a test box) Once you determine the desired value (measure the pot), you can then vastly improve on the results by inserting internal fixed value low noise film resistors inside your amp in place of the external volume control. A lot of amps get bought and sold simply because the input sensitivity does not match the speaker efficiency. Folks spend big bucks to fix small problems because they do not know the basics. I know because I have learned the hard (can you say EXPENSIVE) way myself. Good luck!
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