HD 300 PROtect (with ActiveGard) · wired · Sennheiser part 506898
The HD 300 PROtect (article 506898) is the HD 300 PRO closed-back, around-ear monitoring headphone with Sennheiser's switchable ActiveGard limiter, which limits peaks above 110 dB. It shares the HD 300 PRO's passive attenuation (rated up to 32 dB), 64 Ω impedance, approx. 297 g weight without cable and replaceable pads, headband padding and cable. It is passive, with no microphone or active noise cancellation. Sennheiser lists a two-year warranty.
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Specifications checked 27 Sept 2026Manufacturer specifications, not a hands-on test.
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HyperX Cloud III727A8AA · Black · wiredThe switchable ActiveGard limiter caps the maximum level at 110 dB SPL when on (123 dB SPL when off), for live, broadcast and high-SPL work.
Sennheiser rates up to 32 dB of passive ambient-noise attenuation, and the pads, headband padding and cable are replaceable.
Sennheiser's product page lists an unexplained 550 g 'product weight', while its specification sheet and quick guide give approx. 297 g without cable.
There is no microphone, wireless connection or active noise cancellation; the ActiveGard limiter is hearing protection against peaks, not noise cancellation.
Exact configuration: 506898 · HD 300 PROtect (with ActiveGard) · wired
23 specifications in 6 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”.
Approximate, without cable, per the specification sheet and quick guide covering both HD 300 PRO and HD 300 PROtect. The product page separately lists 'Product weight (g) 550' without a basis.
The box list names a 1.5 m cable; the specification sheet and quick guide give approx. 1.55 m.
Approximate; the box list names the cable as 1.5 m.
The product page lists 'Battery included: N'.
SourceVoltage reference (dB/V), not dB/mW.
Sennheiser states that the HD 300 PROtect's switchable ActiveGard hearing protection satisfies international directives on industrial safety and noise control.
Sennheiser does not state the transducer diameter on the pages and documents read.
No level tolerance is stated.
The datasheet labels this 'Power rating'; the product page lists the same figure as 'Power consumption (Amp)'.
Attenuation is passive: the page lists 'Noise cancellation (db) Max 32 dB (passive)' and no battery. ActiveGard is a peak limiter, not noise cancellation.
Monitoring headphones; no microphone is listed in the specifications or package contents.
Passive attenuation; not active noise cancellation.
Relative humidity up to 90%.
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