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Message: <blockquote data-quote="Umbra" data-source="post: 8305593" data-attributes="member: 658055">40Hz is the frequency of the sine wave you use as the test tone. It sounds like a loud, continuous noise if you listened to it, which reminds me to mention you should unplug your speakers when you play the sine wave for tuning.The number 40 has nothing to do with your volume. The volume you designate as your max volume doesn't matter, but if you set your gains just short of clipping and go beyond this volume it might clip at times. In the past, people suggested not using the highest value on your HU because it can clip as well. 75% or less is recommended, especially if you're running your speakers off it. If your speakers are on their own amp and everything is using the preouts you could probably max the volume on the HU if you wanted.</blockquote>

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