yogilours

hi just install a new amp with a subwoofer in my eb 2015 9 speakers and dont know why there is a hummm in the subwoofer when i start the engine. what do you think it is cause by what

amp is alpine and sub alpine type r 12inch

Chromeshadow

What amp/subwoofer did you use, what did you use for the 12V signal and the audio input signal?

yogilours

the amp is alpine MRX-V70 5 chanel and subwoofer is alpine type r 12 inch

the 12 v signal is direct to te battery with 4ga wire with 80amp fuse

the input signal is connected with wire on the amp not rca

Chromeshadow

Does the hum change frequency with the speed of your engine? Does it go away when you disconnect the amp input? ( Not the 12V, the audio input)

yogilours

its around 1500 rpm on drive