BUILT-IN AMPLIFIERS!!! Take the Ultra challenge. With more than double the peak power output and substantially HIGHER-gain input than our Original Classic Rumble Road™ Premiums, experience what are easily the best-sounding, loudest amplifier-integrated speakers available aftermarket! Designed specifically for the demanding environments of motorcycles and other powersports vehicles, MHI's high-output, high-fidelity stereo speaker system produces crisp, powerful sound even at highway speeds. Amplifiers are built into BOTH speakers for up to 200 watts of power capability* from your new audio system.