150 Watt XL Series 5.25ö RearSpeaker Features multiple neodymium magnets for increased bass and power handling Features studio quality polystyrene capacitors for crossover XL Model speakers work best when used with an amplifier Speakers offer superior bass response and overall better sound, especially at riding speeds Features carbon fiber woofer cone and titanium impregnated 1ö tweeter Easy plug & play installation. SPEAKER XL REAR 5.25"FLHX