Spec Sheet

PRODUCT SPECIFICATION
HD 300 PRO | HD 300 PROtect
Professional monitoring headset series
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Sennheiser electronic GmbH & Co. KG · Am Labor 1 · 30900 Wedemark · Germany · www.sennheiser.com
FEATURES
• High-resolution and distortion-free sound for professio-
nal monitoring
• Linear frequency response
• Efficient, passive noise attenuation
• Robust design
• Entirely field replaceable components
• HD 300 PROtect with switchable Active Gard hearing
protection satisfies international directives on industri-
al safety and noise control
Closed headphones for professional monitoring in the
studio and for live work. Its highly-sensitive transducers
with precision diaphragms deliver high-resolution, neut-
ral and distortion-free sound across the entire frequency
spectrum.
Viscoelastic earpads and specially sealed acoustic ele-
ments provide efficient shielding against external noise. A
high level of wearing comfort is ensured by optimum pres-
sure distribution and a recess for the fontanelle. Structure
borne noise is filtered out through a coiled cable directly
by the earpiece.
HD 300 PROtect with switchable Active Gard. The hearing
protection technology compresses volumes above 110
dB(A) to a safe level so that no information in the signal
gets lost.
PRODUCT VARIANTS
HD 300 PRO Art. no. 508288
HD 300 PROtect Art. no. 506898
SPECIFICATIONS
Accoustic principle dynamic, closed
Ear coupling circumaural
Frequency response 6 – 25,000 Hz
Impedance 64 Ω
Power rating 500 mW
Sensitivity 108 ±3 dB SPL / 1 Vrms /
1 kHz
HD 300 PRO
Max. SPL w/o ActiveGard 123 dB SPL @ 1 kHz
HD 300 PROtect
Max. SPL ActiveGard off
Max. SPL ActiveGard on
123 dB SPL @ 1 kHz
110 dB SPL @ 1 kHz
Ambient noise attenuation ≤32 dB
Distortion <0.1% @ 1 kHz, 94 dB SPL
Contact pressure approx. 6.0 N
Weigth (w/o cable) approx. 297 g
Cable length approx. 1.55 m
Temperature
Operation:
Storage:
–15 °C to +55 °C
(5 °F to 131 °F)
–55 °C to +70 °C
(–67 °F to 158 °F)
Relative humidity ≤ 90 %