PSB is now shipping an updated and improved version of the M4U TWM wireless earbuds it announced last year. The newest model in PSB’s longstanding M4U line of headphones, the $199 earbuds feature a dual-driver hybrid “micro planar” design and three sound enhancing technologies: RoomFeel, Audiodo Personal Sound, and aptX Adaptive Bluetooth for high quality, low-latency wireless sound. Known for advancing loudspeaker design through decades of work at Canada’s renowned National Research Council (NRC), PSB founder and chief designer Paul S.