With equal sensitivity, the higher the power, the louder the sound. Of course, the portable audio 120 watts even if the power is relatively large, 500 watts of power is rare, most of the portable audio internal battery is 12V, to achieve 500 watts of rated power current needs to be about 40A, so the current of the small capacity of the battery will soon be dead, high-capacity batteries basically will not be mounted on the sound, not to mention the volume of large, the weight is also amazing.