Band: opinion spread · Dot: weighted average
The reason to buy one, and the point that even its harshest critics concede. It seals well, blocks a noisy room and leaks very little, so a click track doesn't bleed into the vocal mic. Two caveats from people who measured or relied on it: the isolation is weakest in the low end, so it dulls a room rather than silencing an engine, and one drummer found it nowhere near a pair of earplugs.
“they’re probably the best isolating headphones I’ve heard out of over 150”
Stuart Charles Black, Home Studio Basics
“But it's insane how much noise they cancel.”
DankPods (YouTube)
“Typical of non-ANC headphones, the HD 280 Pro does not attenuate low frequencies all that well.”
Jasper Lastoria, SoundGuys
“They state to have -32db of isolation, this is a complete lie.”
Unhappy drummer, Thomann owner review (1★)
Measured
Sennheiser claims 'up to 32 dB' of attenuation. SoundGuys measures strong high-frequency blocking, mids cut by half to three-quarters, and little effect on low-frequency rumble. RTINGS finds it isolates more and leaks less than the Sony MDR-7506. Amazon owners mentioning isolation run 582 positive to 126 negative.
vs. listeners — The '32 dB' figure is Sennheiser's and is repeated across retail listings; no independent source here reproduces it. The isolation is real, but it varies with frequency. It is strong on voices and cymbals and weak on low rumble, which is why a drummer comparing it with 30 dB earplugs and an editor in a noisy flat can reach opposite verdicts.
