HD300 PROtect

Sennheiser HD 300 PROtect Closed-Back Studio Monitor Headphones

The Sennheiser HD 300 PROtect are closed-back, over-ear studio monitor headphones offering high-resolution audio reproduction and switchable peak level protection for musicians, audio engineers, and event staff in broadcast, studio, and live stage applications. The precision-diaphragm dynamic drivers produce a wide frequency response of 6 Hz to 25 kHz with low distortion and a maximum SPL of 123 dB. Switch on the Active Gard hearing protection technology to limit levels above 110 dBA for safe listening even with unpredictable source volumes. The HD 300 PROtect's circumaural, closed-back design provides up to 32 dB of passive isolation from ambient noise.

Thick ear cushions and headband padding ensure comfortable wearing for long listening sessions. The detachable 4.9' single-sided cable is terminated with a 3.5mm stereo mini-jack and may be swapped for other Sennheiser modular cables (available separately). A 1/4" TRS adapter is included to allow easy connectivity with mixers, dedicated headphone amplifiers, and audio interfaces. The HD 300 PROtect headphones fold for compact storage and transport.


  • Complies with European EC industrial safety and noise control standards
  • Safeguards hearing and presence of mind for listeners
  • Switchable Active Gard technology attenuates signals above 110 dB down to a safe level while maintaining clear, distortion-free sound
  • Sensitive transducers, precision diaphragms, and a 6 Hz to 25 kHz frequency response provide neutral, high-resolution audio reproduction
  • Soft, cushioned viscoelastic earpads and headband padding ensure consistent comfort for long sessions
  • Closed-back, over-ear design delivers up to 32 dB of ambient noise attenuation
  • Detachable single-sided cable features a 3.5mm stereo mini jack
  • Includes 1/4" TRS adapter

Tech Specs

Driver Type Dynamic
Design Over-Ear (Circumaural)
Earcup Style Closed-Back
Frequency Response 6 Hz to 25 kHz
Sensitivity 108 dB at 1 kHz
Impedance 64 Ohms
Maximum Sound Pressure Level (SPL) 123 dB at 1 kHz
Maximum Power Handling 500 mW
Total Harmonic Distortion (THD) 0.1%
Active Noise Cancellation No
Noise Attenuation Up to 32 dB
Volume Limiting 110 dB
Foldable Yes
Contact Pressure 6 N
Audio Connector to Source 1/8" / 3.5 mm TRS Straight
Adapter (Included) 1/4" TRS
Connector to Earpiece 1 x Proprietary
Cable Design Single-Sided
Cable Color Black
Detachable Yes
In-Line Remote/Microphone No
Cable Length 4.92' / 1.5 m (Unbalanced)

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