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<blockquote data-quote="billetz23" data-source="post: 363081" data-attributes="member: 540780">engine noise/ hissone or more of the screws you are using&nbsp; to mount the amp to the carmetal/chasis maybe causing a ground loop&nbsp; mounting your amp to a peiceof board may break the loopTRY&nbsp; THIScut&nbsp; a piece of 3/4&#039;&#039;particle board a little larger then your amp, and mount it to thechasis/metal of your car where your orion amp is&nbsp; one screw per corner&nbsp;&nbsp; then mount your amp to the wood using screws haft the depth of your board (so the screw does not go through the metal of your car) make sure the screws of the board that you mounted to the car chasis/metal&nbsp;&nbsp; is not touching the amp bottomin anyway&nbsp;&nbsp; if it does it will creat a ground loop.then use the (chasis/metal) area where you have your amp grounded to nowjust clean the metal of all paint/primmer so you will have bare metalto ground your amp too</blockquote>

[QUOTE="billetz23, post: 363081, member: 540780"] engine noise/ hiss one or more of the screws you are using to mount the amp to the car metal/chasis maybe causing a ground loop mounting your amp to a peice of board may break the loop TRY THIS cut a piece of 3/4''particle board a little larger then your amp, and mount it to the chasis/metal of your car where your orion amp is one screw per corner then mount your amp to the wood using screws haft the depth of your board (so the screw does not go through the metal of your car) make sure the screws of the board that you mounted to the car chasis/metal is not touching the amp bottom in anyway if it does it will creat a ground loop. then use the (chasis/metal) area where you have your amp grounded to now just clean the metal of all paint/primmer so you will have bare metal to ground your amp too [/QUOTE]

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