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<blockquote data-quote="Jepalan" data-source="post: 8396125" data-attributes="member: 655519">It depends on the amp design.&nbsp; But better safe than sorry.&nbsp; The only warning of significance in any of the new Pioneer installation manuals says to always connect the HU and amp grounds before any other wires and to disconnect them last. This prevents possible ground currents from flowing from the amp through the RCA ground on HU or vice-versa.From the Pioneer NEX manual...WARNING:The black cable is ground. When installing this unit or power amp (sold separately), make sure to connect the ground wire first. Ensure that the ground wire is properly connected to metal parts of the car’s body. The ground wire of the power amp and the one of this unit or any other device must be connected to the car separately with different screws. If the screw for the ground wire loosens or falls out, it could result in fire, generation of smoke or malfunction.</blockquote>

[QUOTE="Jepalan, post: 8396125, member: 655519"] It depends on the amp design. But better safe than sorry. The only warning of significance in any of the new Pioneer installation manuals says to always connect the HU and amp grounds before any other wires and to disconnect them last. This prevents possible ground currents from flowing from the amp through the RCA ground on HU or vice-versa. From the Pioneer NEX manual... WARNING: The black cable is ground. When installing this unit or power amp (sold separately), make sure to connect the ground wire first. Ensure that the ground wire is properly connected to metal parts of the car’s body. The ground wire of the power amp and the one of this unit or any other device must be connected to the car separately with different screws. If the screw for the ground wire loosens or falls out, it could result in fire, generation of smoke or malfunction. [/QUOTE]

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