The M4U 4s use a two-way Hybrid Dual-Driver design, incorporating a moving coil low-frequency driver and a balanced armature high-frequency driver.
PSB says that by combining the two it has been able to get greater precision from its RoomFeel technology, which is said to “add back the acoustic signature” to create a “more spacious and realistic presentation of recorded music".
The M4U 4 earphones have a round-the-ear cable design, with the aim of providing a more secure fit for active users. The in-ears come supplied with two detachable cables: one with a three-button control unit with mic and one without.
The PSB M4U 4 in-ear monitors will be on sale from October, priced £229.