EpyxThanks Epyx. Yes, MB Quart has a couple decades in the mobile audio side, but, the company was founded as a designer and manufacturer of microphone elements. (MB) stands for "microphone builder".. that was in the 60's. Home products, studio, headphones, marine, powersports, car.. all part of the MB Quart heritage. Here's a throw back pic from the headphone business in the 90's. The website has it all.