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<blockquote data-quote="buildmeabox" data-source="post: 2269954" data-attributes="member: 560799">The &quot;gains&quot; are designed to match the output of your HU to the input of the amp.&nbsp; Always start, when setting an amp in a new install, on the lowest setting, usually turning the gain counter clockwise until it stops.&nbsp; Rookies assume the gain is a volume control and tend to set it at max.&nbsp; All you&#039;ll get when this happens is &quot;hissing&quot; noise when the CD goes from one track to the next.&nbsp; A 1/4 turn is plenty in most installs.Don&#039;t worry about your 4 ohm load,&nbsp; as long as the drivers installed play at different freq. the amp will see the common resistance between the drivers.&nbsp; For example if you hookup a tweeter 5khz-20khz and a midrange driver 500hz-5khz and both drivers are 4 ohm speakers the amp will see a 4 ohm load.&nbsp; If you hook up a pair of 4 ohm subs running 20hz-500hz for both the amp will see a 2 ohm load.I would suggest you buy a multimeter and learn how to use it, you&#039;ll be amazed how much easier it will be to understand how the laws of resistance work and how the length of cable will effect it.&nbsp; You don&#039;t need to buy an expensive one Radio Crap sells some for $19 bucks.</blockquote>

[QUOTE="buildmeabox, post: 2269954, member: 560799"] The "gains" are designed to match the output of your HU to the input of the amp. Always start, when setting an amp in a new install, on the lowest setting, usually turning the gain counter clockwise until it stops. Rookies assume the gain is a volume control and tend to set it at max. All you'll get when this happens is "hissing" noise when the CD goes from one track to the next. A 1/4 turn is plenty in most installs. Don't worry about your 4 ohm load, as long as the drivers installed play at different freq. the amp will see the common resistance between the drivers. For example if you hookup a tweeter 5khz-20khz and a midrange driver 500hz-5khz and both drivers are 4 ohm speakers the amp will see a 4 ohm load. If you hook up a pair of 4 ohm subs running 20hz-500hz for both the amp will see a 2 ohm load. I would suggest you buy a multimeter and learn how to use it, you'll be amazed how much easier it will be to understand how the laws of resistance work and how the length of cable will effect it. You don't need to buy an expensive one Radio Crap sells some for $19 bucks. [/QUOTE]

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