Closed-back professional monitoring headphones from sE Electronics with adjustable bass control put critical frequency response shaping directly in the hands of the listener. The KLS150 uses a dual-shell earcup design that provides superior sound isolation during tracking, mixing, and live monitoring applications. Interchangeable earcup covers allow for visual customisation while maintaining acoustic performance, and the headphones are constructed to withstand the demands of frequent transport and daily studio use. Easy-to-read adjustment markers ensure repeatable bass settings across multiple sessions. The bass adjustment mechanism offers on-the-fly low-end control without requiring external EQ or processor chains, giving engineers and producers direct tonal response adjustments during monitoring. Earcup padding has been designed for extended wear comfort during marathon mixing and recording sessions. The closed-back architecture prevents signal bleed into open microphones during vocal and instrument tracking, while maintaining consistent acoustic isolation in high-SPL environments such as front-of-house and monitor mixing positions. Rugged construction combines lightweight materials with reinforced stress points for reliable performance during tour and location recording work. Features Closed-back over-ear design for professional monitoring and mixing applications Adjustable bass control with precise, repeatable settings via visual markers Dual-shell earcup construction for superior sound isolation during tracking Interchangeable earcup covers for easy visual customisation and replacement Extended-wear comfort padding for long studio and mixing sessions Rugged construction designed for tour, location recording, and transport Low-bleed acoustic design prevents signal leakage into open microphones Suitable for FOH, monitor mixing, recording, and critical listening tasks