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The purpose of the gain is to match the signal volts RMS coming from the source (CD player, etc.) to the input of the amp for correct power matching and to minmize clipping.

The best method is to use an oscilloscope but not everyone can afford a $1500 o-scope or has access to one.

The next best method is using a DMM (digital multi-meter) along with the guide I have made (test tone included).

Setting the gain by ear is ONLY a last resort and is not recommended.

My guide not only helps with setting the gain but it also has a power wire size calculator and an electrical system evaluation calculator and can be found here.

http://www.box.net/shared/uchv4dbk88

You will need:

· DMM (about $15 from Radio$hack)

· Microsoft Excel to use my guide

· A way to burn an audio CD from an MP3

If you don't have Excel, you can download (free) OpenOffice by Java (Sun Micro systems) from here to read spreadsheets (and you thought spreadsheets were for business) - http://download.openoffice.org/index.html

See my site for more info http://sparky3489.webs.com/amplifiergain.htm

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