It is true that it does not rev powerful but they have a bulb on the filter to the hps being protected, to make small evening is not as widely as possible over 50 or 60 people but for a they have a small budget compared excllent / quality of the best prices marcher.les his powerful enough bass and treble are apprsiable not like the sound boost.pour commancer in a 15 or 16 is very s well