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Message: <blockquote data-quote="maylar" data-source="post: 8130941" data-attributes="member: 541144">1 - They boost the output of your head unit preouts to a higher voltage with low source impedance. This allows running long cables or multiple cables with minimal noise pickup.2 - Very rarely required. I've never used one.3 - Noise is relative to the signal level. Just for the sake of explanation, lets say your cables pick up 1/1000th of a volt of noise. If your preouts are 2 volts then the signal to noise ratio is 2000:1. If the line voltage is 8 volts then the s/n ratio is 8000:1 - you hear less noise.4 - Yes the EQL has a line driver. However - to get any benefit it has to be mounted close to the HU before the RCA cables. If you mount it in the trunk close to the amp the cable noise is already there and higher line voltage loses its advantage.</blockquote>

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