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<blockquote data-quote="helotaxi" data-source="post: 3172536" data-attributes="member: 550915">Neither signal nor speaker wire will pick up noise unless you have a serious problem with your battery or alternator.A ground loop isolator is a band-aid.&nbsp; It might get rid of the noise but it will usually kill your frequency response as well.&nbsp; Hardly a real solution when there are real solutions out there.First isolate the noise.&nbsp; Unplug the RCAs from the amp.&nbsp; If you still have noise, the problem is with the amp.&nbsp; That&#039;s a distinct possibility since you shorted the leads (always disconnect the neg wire from the battery before working on wiring).&nbsp; If the noise is gone with the no signal going to the amp, then the problem is with the HU.&nbsp; Usually the HU ground is the problem, but Pioneer units have a history of the internal signal ground path resistors blowing allowing a ton of noise into the system.&nbsp; The solutions to this are:&nbsp; send the unit to get repaired or ground the barrels of the RCAs at the HU.&nbsp; There are several threads about how to do that on the forum here.</blockquote>

[QUOTE="helotaxi, post: 3172536, member: 550915"] Neither signal nor speaker wire will pick up noise unless you have a serious problem with your battery or alternator. A ground loop isolator is a band-aid. It might get rid of the noise but it will usually kill your frequency response as well. Hardly a real solution when there are real solutions out there. First isolate the noise. Unplug the RCAs from the amp. If you still have noise, the problem is with the amp. That's a distinct possibility since you shorted the leads (always disconnect the neg wire from the battery before working on wiring). If the noise is gone with the no signal going to the amp, then the problem is with the HU. Usually the HU ground is the problem, but Pioneer units have a history of the internal signal ground path resistors blowing allowing a ton of noise into the system. The solutions to this are: send the unit to get repaired or ground the barrels of the RCAs at the HU. There are several threads about how to do that on the forum here. [/QUOTE]

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