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<blockquote data-quote="helotaxi" data-source="post: 3532448" data-attributes="member: 550915">Do you HAVE to have front-rear fade capability?&nbsp; Can you configure the amp to get signal to all 4 channels with only a pair of inputs?&nbsp; I&#039;m pretty sure that you can.&nbsp; If the noise is only present with two sets of RCAs connected and you can get noise free operation of all 4 channels with only one set connected, only connect one set.&nbsp; You can use the gain controls to balance the level front to rear and then leave it set.My guess as to the actual problem is that a single RCA pair has more resistance than the ground of the HU but adding the second lowers the resistance enough that you get a ground path for the HU through the RCAs when both are connected.&nbsp; Where is your HU grounded and with what size wire?&nbsp; Second possibility (and one I have a bit of personal experience with) is that you have a switch on the amp that is stuck in a an inbetween position and connecting the second set of RCAs is allowing the front channels to short to the rear channels causing your noise.&nbsp; Check the switch positions on you amp.&nbsp; Positively move them to a different position and them move them back to where you want them.gijoe- I&#039;d wager that the source of your problem is still a marginal HU ground and the reason that the Monster cables worked to fix the problem is that they are directional cables.&nbsp; That means nothing more than the barrel of the RCA is only grounded to the shield on one end and the resistance overall is higher not allowing the HU to partially ground through the RCAs to the amp.</blockquote>

[QUOTE="helotaxi, post: 3532448, member: 550915"] Do you HAVE to have front-rear fade capability? Can you configure the amp to get signal to all 4 channels with only a pair of inputs? I'm pretty sure that you can. If the noise is only present with two sets of RCAs connected and you can get noise free operation of all 4 channels with only one set connected, only connect one set. You can use the gain controls to balance the level front to rear and then leave it set. My guess as to the actual problem is that a single RCA pair has more resistance than the ground of the HU but adding the second lowers the resistance enough that you get a ground path for the HU through the RCAs when both are connected. Where is your HU grounded and with what size wire? Second possibility (and one I have a bit of personal experience with) is that you have a switch on the amp that is stuck in a an inbetween position and connecting the second set of RCAs is allowing the front channels to short to the rear channels causing your noise. Check the switch positions on you amp. Positively move them to a different position and them move them back to where you want them. gijoe- I'd wager that the source of your problem is still a marginal HU ground and the reason that the Monster cables worked to fix the problem is that they are directional cables. That means nothing more than the barrel of the RCA is only grounded to the shield on one end and the resistance overall is higher not allowing the HU to partially ground through the RCAs to the amp. [/QUOTE]

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