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<blockquote data-quote="jasoncl75" data-source="post: 8374838" data-attributes="member: 665609"><p>The dimming is usually an indication of poor power and/or ground. You mentioned the ground wire size, but what about the power wire size?&nbsp; Fosgate amps are power hungry.&nbsp; Feed them WELL.&nbsp; Just keep in mind your ground size needs to be same size or bigger.&nbsp;&nbsp; Rule of thumb...you can never have too big or too many grounds.&nbsp; Especially from battery to car frame/chassis. Grounds from chassis to motor as well.&nbsp; &nbsp;&nbsp; Ground from the amp should be as short as possible.&nbsp; And even bigger wire than the power.&nbsp; As for tuning, in my experience, 6x9&#039;s somewhere in the 120-140hz range.&nbsp; But, if memory serves, your particular set came with its own xovers?&nbsp; As for the infinitys, same thing.&nbsp; The infinitys might even be able to go around 100hz.&nbsp; &nbsp; Amp settings are primarily based on input from the HU.&nbsp; Turning the gain all the way up isnt really the right way.&nbsp; Andnit can at times cause dimming as the amp is working harder than designed.&nbsp; Might not be the case for you.&nbsp; Your HU uses 4v preout voltage,&nbsp; just make sure the HU output and the amp input level are matched.</p></blockquote><p></p>

[QUOTE="jasoncl75, post: 8374838, member: 665609"] The dimming is usually an indication of poor power and/or ground. You mentioned the ground wire size, but what about the power wire size? Fosgate amps are power hungry. Feed them WELL. Just keep in mind your ground size needs to be same size or bigger. Rule of thumb...you can never have too big or too many grounds. Especially from battery to car frame/chassis. Grounds from chassis to motor as well. Ground from the amp should be as short as possible. And even bigger wire than the power. As for tuning, in my experience, 6x9's somewhere in the 120-140hz range. But, if memory serves, your particular set came with its own xovers? As for the infinitys, same thing. The infinitys might even be able to go around 100hz. Amp settings are primarily based on input from the HU. Turning the gain all the way up isnt really the right way. Andnit can at times cause dimming as the amp is working harder than designed. Might not be the case for you. Your HU uses 4v preout voltage, just make sure the HU output and the amp input level are matched. [/QUOTE]

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