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<blockquote data-quote="RobGMN" data-source="post: 8917617" data-attributes="member: 683408">OP: Let&#039;s make sure you have actually isolated the problem to the amp, or we all may be chasing ghosts on your behalf.Did you &quot;Try isolating the amp by hooking it direct to the battery, with short cables, and connecting an external speaker to the outputs, nothing else. Keep vehicle off.&quot; ?Did you: &quot;Even better (but less likely a scenario), connect to a battery that&#039;s not in a car.&quot; ?Did you: &quot;connect rca cables to the input jacks, then short the center pin tot he outer shield ring, to see if the hiss diminishes.&quot; ?Did you: &quot;try turning the gain to both extremes, and listen for any change.&quot;If not, then you didn&#039;t actually isolate the amp as the problem. You need to eliminate all the other variables. If not, you can&#039;t zero in on the source of the noise.</blockquote>

[QUOTE="RobGMN, post: 8917617, member: 683408"] OP: Let's make sure you have actually isolated the problem to the amp, or we all may be chasing ghosts on your behalf. Did you [I]"Try isolating the amp by hooking it direct to the battery, with short cables, and connecting an external speaker to the outputs, [U]nothing else[/U]. Keep vehicle off." ?[/I] Did you: [I]"Even better (but less likely a scenario), connect to a battery that's not in a car." ?[/I] Did you: [I]"connect rca cables to the input jacks, then short the center pin tot he outer shield ring, to see if the hiss diminishes." ?[/I] Did you: [I]"try turning the gain to both extremes, and listen for any change."[/I] If not, then you didn't actually isolate the amp as the problem. You need to eliminate all the other variables. If not, you can't zero in on the source of the noise. [/QUOTE]

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