I have a basically brand new MM4000.1 for sale. It has never seen low voltage or a load below 1ohm per channel. These amps are monsters and are capable of putting out of 4400 watts continuous power. I have the remote bass knob but it was never used. Looking to get 750 plus shipping if you have any question please do not hesitate to email me or pm me. I have plenty of refs on other forums and perfect feedback on ebay under ogbigoso.