I have 3 units,but they are the E-8/9's two powered with sound and one dummy. No troubles with them so far,but with sound usuing DC they take a huge ammount of juice before you can get them up to speed.I say this because my older PCM (Now BLI) sound equiped E-7 takes only a wee bit more power when starting then the DC version I also have,but not either of the sound equiped E-8's when run singly on DC they will not start untill almost full blast throttle setting, Nate Goodman (Nato).