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<blockquote data-quote="Doxquzme" data-source="post: 8920859" data-attributes="member: 689267">Careful,&nbsp; you should be using the factory head unit speaker output leads for the source, not after the amplifier.&nbsp; The amp&#039;s output is likely too high for the LC8i and may also be dirtier than the headunit&#039;s output.Additionally, the factory HU is going to want to see a load from the speakers, and since you would be circumventing this, you will likely need LGDs (load-generating device) inline with the LC8i (non-pro version).Additinally, consider the LC8i Pro.Your subwoofer tuning (the loaded CT sounds 12&quot;) frequency is tuned to 34hz and the LC8i&nbsp; non-pro version has a fixed HP (subsonic) filter set at 33hz and the LC8i-pro has a fixed HP filter at 22hz.You don&#039;t want your subsonic (HP) filter at less than a half octave below the tuning frequency of the sub, at 34 hz, that is aproximatley 24hz for the HP (subsonic) filter.The LC8 you have (if the non-pro version) is going to interfere (at an unacceptable level IMHO) with the bottom end of the subwoofers&#039; output.A 33hz HP filter (present on the LC8)&nbsp; would be used in a subwoofer tuned to roughly 48hz or higher.</blockquote>

[QUOTE="Doxquzme, post: 8920859, member: 689267"] Careful, you should be using the factory head unit speaker output leads for the source, not after the amplifier. The amp's output is likely too high for the LC8i and may also be dirtier than the headunit's output. Additionally, the factory HU is going to want to see a load from the speakers, and since you would be circumventing this, you will likely need LGDs (load-generating device) inline with the LC8i (non-pro version). Additinally, consider the LC8i Pro. Your subwoofer tuning (the loaded CT sounds 12") frequency is tuned to 34hz and the LC8i non-pro version has a fixed HP (subsonic) filter set at 33hz and the LC8i-pro has a fixed HP filter at 22hz. You don't want your subsonic (HP) filter at less than a half octave below the tuning frequency of the sub, at 34 hz, that is aproximatley 24hz for the HP (subsonic) filter. The LC8 you have (if the non-pro version) is going to interfere (at an unacceptable level IMHO) with the bottom end of the subwoofers' output. A 33hz HP filter (present on the LC8) would be used in a subwoofer tuned to roughly 48hz or higher. [/QUOTE]

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