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<blockquote data-quote="VWBobby" data-source="post: 8052715" data-attributes="member: 624844">lol.....a LOC is almost always the worst thing you can use for SQ.&nbsp; It sounds like someone is trying to make a sale (installer).Having a higher voltage does help.&nbsp; I don&#039;t know where the other poster got the idea that it doesn&#039;t.....?You can drive longer RCA cables and also run your gain lower on your amp by using a higher voltage head unit.&nbsp;&nbsp; Lower gain = less induced noise (noise floor) and less chance for engine whine/EMI noise.The output should already be un-filtered.&nbsp; If it isn&#039;t, all you will hear is bass below whatever frequency (HZ) that your LPF is set at.For instance, if you plug your RCAs from your high amp into the OUTPUT of your subwoofer amp, and hear full range normal sound - you have unfiltered audio.If you plug your RCAs into your output and all you hear is bass, then you know that is filtered output (after the LPF).It also depends on if you have the LPF activated on the head unit.&nbsp; It has to be off or the test is invalid. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif</blockquote>

[QUOTE="VWBobby, post: 8052715, member: 624844"] lol.....a LOC is almost always the worst thing you can use for SQ. It sounds like someone is trying to make a sale (installer). Having a higher voltage does help. I don't know where the other poster got the idea that it doesn't.....? You can drive longer RCA cables and also run your gain lower on your amp by using a higher voltage head unit. Lower gain = less induced noise (noise floor) and less chance for engine whine/EMI noise. The output should already be un-filtered. If it isn't, all you will hear is bass below whatever frequency (HZ) that your LPF is set at. For instance, if you plug your RCAs from your high amp into the OUTPUT of your subwoofer amp, and hear full range normal sound - you have unfiltered audio. If you plug your RCAs into your output and all you hear is bass, then you know that is filtered output (after the LPF). It also depends on if you have the LPF activated on the head unit. It has to be off or the test is invalid. [IMG]//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif[/IMG] [/QUOTE]

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