Gain settings Simplified.
For the easy understanding, I have considered a JBL GTO - 75.4 amplifier.
1 - Set everything to "0" - flat eq, hpf off, lpf off bass boost off,loudness off, all x-overs flat... every thing a huge 0 on the HU as well as the amp.
2 - Get the gains all the way down...before you proceed further..
3 - Take a DMM ( digital multi meter ) and a 1KHz test tone to set gains on a class AB amp for mids and highs
download it from here
1KHz 0db.mp3 - File Shared from Box.net - Free Online File Storage
burn it on a cd to play ...
4 - Set the DMM to measure AC voltage ( not DC ) , remove ch 3 & 4 speakers as we are going to set only ch1& 2 right now.
5 - Play the 1KHz test tone and put the volume on the HU at 80% of the full volume...
6 - Connect the + of multimeter to +ve of speaker output terminal, and -ve to -ve ....
7 - If the amplifier is 75wrms x 4 ch, you should aim at a voltage reading of 17.3 volts ( this is calculated by ohms law ). So adjust your gain knob till you get a reading of 17.3 volts. this would be a precise technical way to set amplifier gains.
8 - Disconnect ch1&2 and connect 3 & 4 repeat the same process for gain settings of these channels.
9 - slight deviation in these readings would be ok.
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