The 15 & 20 refer to the power rating in amps. I have mine on a 15 amp Core Power (1800 watts) I also have a dedicated 20 amp circuit and about the same number of components. If you plan on getting more components or super high powered amp, you may need the 20 amp. But either one will work and certainly the 20 won’t damage anything. It just refers to the amperage the unit can handle. The 20 can power MORE things.
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