So already I do not own these speakers, but when I go to a water park, he had 3 food by Interm amplifier, the sound was not very good, finally, it was a little crillard, but many moin I the thought, the sound was pretty good for a pregnant has piezo !! The chamber lacked serious but normal, there is a 31 cm woofer !! I find them relatively expensive (that's why I put 5/10), that price is just having Peavey Pro15, T15 and EVPs of Audiophony 15 Warfedale pro who must given a much better sound !!dropoff window