The only way to tell for sure is to open it and check the output modules or transistors to see what power rating they have or measure the actual power. The 1400 watt figure is useless. Regular receivers, integrated amplifiers and basic power amps are required by the FCC in the US to measure and present the power spec in a uniform way to make comparisons easy (although there is a lot of room to make things look better than they are here too). Car stereo and subwoofers are exempt. With subwoofers the power doesn't really matter since it doesn't help you compare which woofer will play louder or better. In car stereo they just lie like crazy.