Description
The HD 820 solves a problem that’s plagued closed-back headphones for decades: how do you seal off sound leakage without trapping resonance and coloring the signal? Sennheiser’s answer is a pair of concave Gorilla Glass reflectors positioned behind each driver, redirecting acoustic energy from the 56mm ring radiator transducers into a dedicated absorption system rather than letting it bounce back and muddy the sound. The result is a closed-back headphone that behaves acoustically like an open one, with none of the isolation trade-offs.
Each driver is anchored at both its inner and outer edges for tighter structural control, which pays off in imaging precision and low distortion (rated at 0.02% THD). Every unit ships with its own individually measured frequency response plot tied to its serial number, a nod to the unit-to-unit consistency Sennheiser holds itself to at this reference tier.
Build quality matches the engineering ambition: designed in Germany and assembled at Sennheiser’s Irish facility, with an adjustable metal headband and microfiber-padded earcups shaped for extended sessions. Connectivity is flexible, with XLR-4, 1/4-inch, and 4.4mm jack options to match your amp or interface of choice.
- 56mm Ring Radiator dynamic drivers, dual-edge mounted for stability
- Gorilla Glass reflectors paired with an acoustic absorber to fight resonance and frequency masking
- Frequency response: 6Hz–48kHz (-10dB), 12Hz–43.8kHz (-3dB)
- Impedance: 300 ohms; SPL 103dB @ 1kHz, 1V; magnetic field 10.5 mT
- Adjustable metal headband with microfiber earpad padding
- Individually measured, serial-numbered frequency response documentation
- Straight cable, 9.8 ft.; weight 0.79 lbs.; color: black
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