Skar RP-1200.1D Review: Max Power vs RMS Explained

As listed, it is a max power figure, not an RMS rating. Under the CTA-2006 mobile audio standard, only an RMS rating reflects continuous power measured at 1 percent distortion into a stated impedance at 14.4 volts. Max and peak figures are not measured to any such standard, and there is no fixed ratio between a max number and the RMS figure a given amplifier will actually sustain, which means two amplifiers both labeled 1,200 watts max can have meaningfully different real-world output.

Skar does list RMS specifications for its amplifier lineup on its own product pages, so the practical step is to look up the current RMS rating for this exact model before treating 1,200 watts as the number to build a system around. Our RMS vs peak power calculator explains why this distinction changes wire, fuse and subwoofer matching decisions.

Sizing a fuse off a max number rather than a confirmed RMS figure risks getting the wire gauge wrong in either direction: undersizing it if the real RMS draw turns out higher than expected, or paying for heavier cable than the amplifier will ever actually pull. The safer approach is to track down the manufacturer's published RMS rating for this specific model before wiring, run that RMS number through a current draw calculation, and size the fuse and wire to that figure rather than to the max number printed on the box.

Once you have a confirmed RMS figure, our amp fuse calculator and amp wire gauge calculator will get you to a fuse and gauge that actually match the amplifier's real draw rather than its marketing number. A fuse protects the wire itself, not the amplifier, so it should be sized at or below the ampacity of whatever gauge you settle on, and the main fuse holder always belongs within 18 inches of the battery's positive terminal, not down at the amplifier end of the run.

The included remote control lets you adjust subwoofer output level from the dash rather than reaching back to the amplifier itself, which is a convenience feature, not a substitute for setting gain correctly in the first place. Gain should be set once, at installation, using a multimeter or oscilloscope against a test tone, matched to the head unit's actual clean voltage output. The remote knob is meant for day-to-day volume balance between the subwoofer and the rest of the system, not for compensating for a gain that was never set correctly. Our gain setting calculator covers the initial setup that the remote knob should be riding on top of, not replacing.

A common mistake with any remote level knob, on this amplifier or any other, is using it to chase a louder sound after gain was set carelessly, which just pushes the amplifier closer to clipping rather than fixing the actual problem. Set gain correctly once with proper tools, then treat the remote knob as a small trim adjustment for taste, not a workaround for a poor initial setup.

Buyers who need a firm, documented RMS figure before purchase, rather than a max power number, should look up Skar's separate RMS specification sheet for this model first or consider a competing amplifier whose retail listing states RMS directly. Anyone planning a system around multiple high-power subwoofers where precise, verified output matters more than convenience features like the remote level control may also be better served by an amplifier line that publishes RMS on the box itself.

Buyers who are not willing to do the extra step of cross-checking a separate specification sheet before wiring should also think twice, since sizing a fuse and wire gauge off the max number alone risks getting the ampacity calculation wrong in either direction. If tracking down a confirmed RMS figure before buying feels like more homework than you want to do, an amplifier that states RMS directly on the retail listing itself removes that extra step entirely.