I use it for 3 years and never a problem
the advantage of this amp is a power decoupling longer need to worry about the legality of the tension. There the switch has three positions for the rise time also it is equipped with an internal filter, the only problem is that it is divided on both channels, a voice is the low end and the other takes relay to the top.
I turned with great amp and is sure he is not at a LAB-GRUPPEN but considering the price there is nothing to say we can torture him he does not flinch
Now I used the amp back as four or tired it takes all its value because of the voice output of the A Speakon 4 points is fed through the inlet A and B ie A input of +1 / -1 and input B +2 / -2 So I draw a single line by hp amp and I switch behind the back along the path desired. Indeed the VS15 from home HORTUS you can choose through the switch to switch to either channel Speakon
I recommend it to all those who want to simplify the wiring back LIVE especially time saving for installation and dismantling of the economy excluding cable