Focal Stellia vs Sennheiser HD 820
Both are dynamic closed-back headphones.
The HD 820 is 75 g lighter, at 360 g against 435 g.
The HD 820 needs 8 dB more power to reach a loud 110 dB peak, so it asks more of the amplifier.
The HD 820 lists for $799 less.
$2,999
$2,199.95
Side by side
StelliaHD 820
- Driver
- Dynamic
- Dynamic
- Diaphragm
- Pure beryllium M-shaped dome
- 56 mm ring radiator, fixed at outer and inner edges
- Driver size
- 40 mm
- 56 mm
- Enclosure
- Closed-back
- Closed-back
- Weight
- 435 g
- 360 g
- HD 820 is 75 g lighter
- Impedance
- 35 ohms
- 300 ohms
- Sensitivity
- 106 dB SPL / 1 mW @ 1 kHz
- 103 dB SPL (1 V)
- Power for 110 dB
- 2.51 mW, 0.30 V
- 16.6 mW, 2.23 V
- HD 820 needs 8 dB more
- Drive
- Easy to drive
- Easy to drive
- Frequency response
- 5 Hz – 23 kHz (±3 dB)
- 6 Hz – 48 kHz (−10 dB)
- Made in
- France
- Ireland
- Released
- 2019
- 2018
- List price
- $2,999
- $2,199.95
- HD 820 is $799 less
From each maker’s published figures; sources are on each headphone’s page. Power for 110 dB is worked out from sensitivity and impedance.
Amplifiers that drive both
How the matching worksEach of these has 10 dB or more in reserve above a loud 110 dB peak on both headphones, so one amplifier serves either.
Where to buy the Stellia
List $2,999
Retailer prices checked 2026-10-21. We may earn a commission on purchases. How this works
Where to buy the HD 820
List $2,199.95
Retailer prices checked 2026-10-21. We may earn a commission on purchases. How this works