Agree with Bridgman, sounds like your speakers are out of phase. Use a AA battery, disconnect speaker wires from amp/receiver, one speaker at a time hold positive (red terminal) wire to the positive pole of the battery, and the black terminal wire to the negative pole, and observe drivers. If they move out when energized, you're in phase, if in, you are out of phase. Sometimes, the internal wiring of a speaker may be reversed, so trust the battery test over the color of the terminal.
The M80s have jumpers. You should check to see if you have connected the jumpers. If not, then you are only driving half of your M80s.
All drivers working in phase should give very pleasant sound quality with decent bass response.
Good luck.
Last edited by 2x6spds; 03/20/20 07:11 AM.
