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I think that was just an example.

Your Pioneer amp has "Channel A" and "Channel B", each are actually 2 channels of output. They give you 2 gains in case you are using 2 of those for mid/high and the other 2 for say a sub, it allows you set the gain for each as you wish. in that case you may want to your sub to have more power than your mid/highs, so you would turn the gain on their side down.

so yes, your formula is correct, but figure 4 ohms on the pioneer amp, or whatever it is that is actually being connected to it (just round it to 4 or 2, no need to set them based on 3.8ohm or whatever it is.
 

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If you have USB connectivity, you can download 50 and 1000 Hz tones here, it may be more stable that your bluetooth:

 

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the "occasional clipping" is so you can get the most power out of your amp, but it won't be the cleanest signal to your speakers. Some distortion isn't audible in your subs, but too much will cause overheating.
 
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