And there are a couple things wrong with the method in the pic you posted.
1. They don't list a recording decibel level for the tone. I recommend -5 or -3 depending on the user's experience level.
2. Do not set your gains with bass eq's off then turn them back on after. This will most likely lead to clipping and or over powering which is a bad thing.
3. Depending on the deck the sub level should be maxed out. Can't say for all but decks like pioneers it is an attenuation. So full output is at +6. You want it at that for good pre out voltage for setting your gain.
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4 15s + Flat Wall + 10k = Loud