Size does matter! Choosing the ideal subwoofer is all about space and power. Smaller vehicles will do best with 10", 8" and even 6" subwoofers, while most midsize and large vehicles with 12" subs. How much power you can feed the subwoofer depends on your budget. Focus on realistic power measured in RMS at 12.8-13.8 volts. ALL of our subwoofers are protected with a 1 year warranty against defects.