So I have a EcoCharge unit coming in... hve the cable to power my MP2, getting a 6-cable with 2 Sony ends on it for SBM1 and M1... some say you can use the M1 w/ 6v just fine due to how its power connection is setup, some say you need a newer M1 or something... my M1 was purchased brand new from Terrapin in summer 2001...am I safe?