I use the PS15 for 4 years 3 times a week to the General Supply (Paris 11) coupled with LS1200 Sub. I also had the opportunity to make it sound in Bourges (inside) and Nantes (outside). I was able to compare and measure the MTD115. Nothing to see! The MTD115 collapse at the top when then away from it all runs the length spectrum with PS15. Attention is not talking about 50 meters! This is not the source line but Bourges and Nantes, he was still well be twenty meters between the PS15 and the console and it stood nickel! In short, the technology used, I have never come across better or even as well, a quality / price unbeatable. I speak for the face. Use in return, MTD115 and PS15 are equal because there is no reason to "go the distance" (unless it is a blonde who sings ... Mouahahahaha).