I received my mp415 last week, bought used with 2 boxes mp418sp.
a single word of the bomb !!!!!!
I have immediately put to the test Saturday night for the sound to the mini concert in a pub.
they held the same shock without souriciller!! a sound and an extra performance, coupled with 2caissons no complaints.
I recommend choosing a course.
a big thank you to insomnia annimation for their serious whatsoever in sending and receiving of the material qualitée.