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Things look good for you sub calculations.
However, on the four channel amp, since you have two gains, each gain controls 200w at 4ohms, so, you would set each gain half of the total output (100w) per channel, using the square root of (100watts x 4ohms) = 20v
When you measure the voltage, you are correct that you would place the leads on the (+) & (-) next to each other for each channel.

The important things to remember are:
  • Unplug the speaker wires from the amp
  • Set your head unit at 75% of its max output
  • Play a 50Hz tone when setting your sub amp and 1kHz on your 4 channel amp.
 

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Premium Member
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1,805 Posts
Regarding the question about the correct setting on you multimeter, the setting you have it on is correct, 200volts. For measurements of volts, ohms, etc... I try to use the closest setting above the expected output... for example on the DC scale, if you were expecting 14volts, use the 50volt scale because it allows for more accurate ranging in the readout.
 
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