sE Electronics KLS 150 – Closed-back monitoring with Bass Control

The sE Electronics KLS 150 is the first pair of professional headphones from the microphone maker, and it is built for the whole signal chain: tracking, mixing and monitoring at front of house. A custom 40 mm driver keeps the low end controlled and readable, and a mechanical Bass Control lets you adjust it without DSP. At Soundium it is our closed-back pick for engineers who move between the studio and the stage.

Key Features

• Custom 40 mm heavy-duty driver: Detailed, low-distortion sound with accurate, controlled bass that translates.
• Acoustic Bass Control: Open or close ports in each earcup to tune the low end without DSP, batteries or electronics.
• Dual-shell closed earcups: Strong passive isolation for loud stages and low headphone bleed into open mics.
• Interchangeable earcup covers: Protect your Bass Control setting from knocks and let you change the look.
• Memory foam and leatherette pads: Pressure-relieving comfort and a tight seal for long sessions.
• Road-ready build: Glass-fibre reinforced parts, corrosion-resistant spring steel and a locking detachable cable.

Customer Benefits

Most closed-backs give you one fixed tuning, which means you need a second pair when the job changes. The KLS 150 lets you set a neutral reference for mixing, add weight for a drummer's cue mix, or bring up punch on a loud stage, all at the earcup. Once you have found your setting, the covers lock it in place, and the laser-etched markers let you return to the same fit every time. The 90° swivelling earcups make one-ear monitoring easy, and the fold-flat design and 335 g weight mean the pair travels well between the control room and the venue.

Quick Specs

• Design: Closed-back, over-ear (circumaural)
• Driver: Custom 40 mm dynamic, neodymium magnet
• Frequency range: 12 Hz – 28 kHz
• Impedance: 39 Ω
• Sensitivity: 98 dB
• Max input power: 1,600 mW
• Cable: 3 m straight, detachable with locking connector
• Dimensions (L × W × H): 166 × 83 × 200 mm
• Weight: 335 g

In the Box

• sE Electronics KLS 150 headphones
• Earcup covers
• 3 m straight detachable cable
• 3.5 mm to 6.35 mm screw-on adapter
• 3.5 mm to USB-C adapter
• Earcup cover opening tool
• Protective drawstring pouch
• sE logo stickers
• User manual

Ideal For

Mixing and critical listening, vocal and drum tracking, FOH and monitor engineering, drummers and touring musicians.

Compatibility

Works with audio interfaces, mixing consoles, headphone amps and laptops via 3.5 mm or 6.35 mm, and with USB-C phones and tablets through the included adapter.

Pros & Cons

✅ Pros:

• Mechanical Bass Control gives several tunings in one pair
• Strong isolation for stages and tracking rooms
• Light, foldable and built for the road
• USB-C and 6.35 mm adapters included

⚠️ Cons:

• Only a straight cable in the box, with no coiled option
• Soft pouch rather than a hard case

If you want one closed-back to mix on, track with and take on tour, the KLS 150 is a strong start for sE in headphones. Pair it with your interface or console and get it from Soundium with a 3-year warranty.