beyerdynamic DT 990 PRO X vs Sennheiser HD 505 SE Copper Edition

What DT 990 PRO X does better (2) and where HD 505 SE Copper Edition wins (0) — every spec side by side.

beyerdynamic · 2025DT 990 PRO X

2 advantages≈ $210

0 advantages≈ $190

3.8Noise control & calls3.8

Why is DT 990 PRO X better than HD 505 SE Copper Edition?

HD 505 SE Copper Edition has no measurable advantages in this pair.

Specifications

Only differences	beyerdynamic DT 990 PRO X≈ $210	Sennheiser HD 505 SE Copper Edition≈ $190
Sound
Fit	On-ear	Over-ear
Ear cup design	Open-back	Open-back
Driver type	Dynamic	Dynamic
Lowest frequency	5 Hz	12 Hz
Highest frequency	40,000 Hz	38,500 Hz
Impedance	48 Ω	120 Ω
Sensitivity	97 dB	106 dB
Noise control
Active noise cancelling	No	No
Connectivity
Wireless	No	No
3.5 mm jack / AUX	Yes	Yes
Design & build
Weight	292 g	—
Colours	Black	Black