sE Electronics KLS 150

The sE Electronics KLS 150 is a professional closed-back over-ear studio headphone designed for precise monitoring, recording, mixing, and live sound. Featuring a specially designed 40 mm dynamic driver, adjustable bass response, and a dual-earcup design, these headphones deliver a balanced soundstage, detailed reproduction, and a high degree of passive noise isolation. This makes the KLS 150 ideal for producers, sound engineers, musicians, and anyone who needs to rely on their hearing while working.

What sets the sE Electronics KLS 150 apart from many other studio headphones is the integrated Bass Control. This allows you to adjust the low frequencies directly on the headphones, without software, DSP, or external equipment. Combined with the comfortable memory foam ear pads, the adjustable headband, and the foldable design, the KLS 150 is designed for intensive use in the studio, during rehearsals, and on stage.

Adjustable bass response with Bass Control
The sE Electronics KLS 150 features an acoustic Bass Control system that lets you adjust the bass response from -5 dB to +5 dB. This allows you to tailor the sound to your application and personal preference. Opt for a neutral sound while mixing, or add extra low end if you’re a drummer, bassist, or live musician looking for more impact in your monitor mix. The Bass Control knobs are located under the removable ear cup covers. Thanks to the tactile controls, you can adjust the settings even while wearing the headphones. Clear markings make it easy to precisely recall previous settings. Since the bass control operates entirely acoustically, no batteries, digital signal processing, or additional electronic circuitry are required. The covers also protect the controls from accidental changes.

40 mm dynamic drivers for precise monitoring
At the heart of the KLS 150 are specially developed 40 mm dynamic drivers with neodymium magnets. These are tuned for balanced frequency response with controlled lows, detailed mids, and clear highs. With a frequency range of 12 Hz to 28 kHz, the headphones offer a wide spectrum for evaluating recordings, instruments, and complete mixes. The acoustic design is optimized for low distortion and reliable low-frequency reproduction. This allows you to better assess how instruments and vocals relate to one another while mixing. When recording drums, guitars, and vocals, the detailed sound reproduction also helps you immediately assess performances and identify any issues.

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Dual-shell construction for effective sound isolation
The KLS 150 features a closed-back design with a dual-shell construction. This so-called dual-shell construction provides a high degree of passive sound isolation and limits the influence of ambient noise on your monitoring. This is important in recording situations where you want to prevent sound from the headphones from being picked up by microphones. During vocal recordings, drum tracking, or instrument recording, this design helps reduce crosstalk from the headphones. The isolation also offers benefits during live performances. FOH engineers, monitor engineers, and musicians can assess their audio signals without ambient noise immediately taking over. The snug-fitting ear pads contribute to the acoustic seal and support consistent bass reproduction.

Comfort for Long Studio Sessions and Live Performances
During the development of the sE Electronics KLS 150, great attention was paid to wearing comfort. The ergonomically shaped headband distributes the weight across the head, while the memory foam padding adapts to the user’s contours. The spacious, over-ear ear cushions are made of high-quality synthetic leather and memory foam. This creates a comfortable fit that also contributes to sound isolation. The design helps minimize pressure points and fatigue during long recording sessions, rehearsals, or live performances. Weighing 335 grams, the KLS 150 offers a sturdy construction without feeling unnecessarily heavy. The design also ensures a comfortable fit around the ears for users who wear glasses.

Sturdy Construction for Professional Use
The KLS 150 is designed for regular use in professional studios and on the go. The construction is reinforced with fiberglass, and the headband features a core made of corrosion-resistant spring steel. This combination ensures durability and flexibility during daily use. Laser-engraved reference marks are applied to the adjustable headband. These allow you to adjust the headphones to the same fit every time. The left and right sides feature clear labels and color-coded foam ear pads, so you can immediately see how to put on the headphones, even on a dark stage. The ear cups can rotate 90 degrees, allowing you to easily monitor with just one ear. This is useful for DJs, producers, and sound engineers who want to stay aware of their surroundings while listening. Thanks to its foldable design, the KLS 150 can also be stored compactly and easily transported.

Detachable cable with locking mechanism and USB-C adapter
The sE Electronics KLS 150 comes with a 3-meter straight audio cable. This cable is detachable and features a locking connector on the headphones. This ensures the connection stays securely in place during use and minimizes the risk of accidental disconnection. The standard 3.5 mm jack makes the headphones compatible with a wide range of audio sources. With the included screw-on 6.35 mm jack adapter, you can connect the KLS 150 to professional audio interfaces, mixing consoles, headphone amplifiers, and other studio equipment. In addition, a 3.5 mm to USB-C adapter is included for connecting to compatible devices with a USB-C port, such as smartphones, tablets, and computers.

Interchangeable ear cup covers
Theear cup covers are interchangeable and form part of the KLS 150’s acoustic design. They protect the Bass Control knobs and contribute to passive sound isolation. The included tool allows you to remove the covers. This gives you access to the controls and lets you replace the covers if desired. The design also allows you to customize the headphones’ look with optional covers in various colors.

Suitable for studio, stage, and professional monitoring
The sE Electronics KLS 150 is designed for applications where accurate sound reproduction and isolation are important. In the recording studio, the headphones are suitable for tracking, editing, mixing, and critical listening. The adjustable bass response allows you to use either a neutral reference or a more pronounced low-end response. For drummers and other musicians performing on a loud stage, the combination of the closed-back design, passive isolation, and Bass Control offers additional control over the monitor mix. The KLS 150 is also a practical choice for FOH and monitor engineers. The swivel ear cups, the familiar fit adjustments, and the lockable cable make these headphones suitable for daily use during rehearsals, soundchecks, and performances.

sE Electronics KLS 150 features:

• professional closed-back over-ear studio headphones
• suitable for monitoring, recording, mixing, and live sound
• specially developed 40 mm dynamic drivers
• neodymium magnets
• frequency response from 12 Hz to 28,000 Hz
• impedance of 39 ohms
• sensitivity of 98 dB
• Maximum input power of 1,600 mW
• Integrated acoustic Bass Control with a control range from -5 dB to +5 dB
• Bass control without DSP, batteries, or external electronics
• Bass Control knobs with tactile feedback
• double-shell earcup construction for high passive sound isolation
• Closed-back design that helps minimize crosstalk to microphones
• Interchangeable ear cup covers
• Covers protect the Bass Control settings from accidental adjustments
• Over-ear ear cushions made of synthetic leather with memory foam
• Ergonomic headband with comfortable padding
• fiberglass-reinforced construction
• Laser-engraved markings for reproducible fit adjustments
• Clear left/right markings with color-coded foam inserts
• Ear cups that rotate 90 degrees for single-ear monitoring
• foldable design for transport and storage
• detachable audio cable with lockable connector
• 3-meter cable length
• 3.5 mm stereo jack connector
• Included screw-on 6.35 mm jack adapter
• Included 3.5 mm to USB-C adapter
• Dimensions (L x W x H): 16.6 x 8.3 x 20 cm
• Weight: 335 grams

In the box:

• sE Electronics KLS 150 studio headphones
• 3-meter detachable straight audio cable
• screw-on 3.5 mm to 6.35 mm jack adapter
• 3.5 mm to USB-C adapter
• ear cup covers
• tool for removing the ear cup covers
• protective pouch with drawstring