Does the Topping A90 drive the Beyerdynamic DT 770 Pro 250?

Computed from measured specifications · target SPL 110 dB · load 300 Ω

Adequate

The Topping A90 adequately drives the Beyerdynamic DT 770 Pro 250 with limited margin (~8.4 dB headroom at 300 ohms; needs ~35.9 mW, delivers 250 mW).

Headroom
8.4 dB
Required (110 dB SPL)
35.9 mW
Delivered (@ 300 Ω)
250 mW
Required voltage
3.02 Vrms

Power Headroom

Headroom: 8.4 dB 0 · target 8.4 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Scale shows dB headroom above the 35.9 mW required to reach 110 dB SPL. Amp delivers 250 mW at 300 Ω (+8.4 dB above target).

Beyerdynamic DT 770 Pro 250 Dynamic · over-ear
Impedance (rated) 250 Ω
Impedance (measured) Source: reference-audio-analyzer.pro/en/r… 254.6 Ω measured
Sensitivity (rated) 96.0 dB/mW
Sensitivity (measured) 94.45 dB/mW measured
Driver Dynamic
Spec basis Measured
Measured by Reference Audio Analyzer (https://reference-audio-analyzer.pro/en/report/hp/beyerdynamic-dt-770-pro-250.php) · Source ↗
Topping A90 Desktop Ss · Single Ended
Output impedance manufacturer 0.1 Ω
Power @ 32 Ω 2000 mW
Power @ 300 Ω 250 mW
Power @ 600 Ω 125 mW *est.
Power source Manufacturer
* Loads marked "est." are derived from the published voltage ceiling at a lower-impedance load (V = √(P·R) → P_higher = V²/R_higher). All derivations are upward only.
Topping A90 SE output per multiple reviews citing manufacturer spec: 2000 mW @ 32 Ω (some sources say 3000 — using conservative 2000 mW), 250 mW @ 300 Ω. Balanced output is ~4× higher. 600 Ω derived from 300 Ω. · Source ↗

Where to buy

Topping A90 on Amazon ↗ Beyerdynamic DT 770 Pro 250 on Amazon ↗

Disclosure: links above are Amazon affiliate links. As an Amazon Associate this site earns from qualifying purchases — at no extra cost to you. Affiliate commissions do not influence verdicts; all analysis is computed independently from the data.

AmplifierHeadroom
Schiit Lyr 3 Ample 14.0 dB
Schiit Valhalla 2 Ample 13.5 dB
JDS Labs Atom Amp 2 Adequate 9.0 dB
Topping L30 Adequate 8.9 dB
iFi Zen DAC V2 Marginal 0.0 dB
Apple USB-C to 3.5mm Insufficient -10.4 dB

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HeadphoneHeadroom
Koss Porta Pro Ample 28.6 dB
Grado SR80x Ample 28.3 dB
HiFiMan Arya Ample 18.0 dB
AKG K702 Ample 17.4 dB
Audio-Technica ATH-R70x Adequate 9.0 dB
Beyerdynamic DT 990 Pro Adequate 7.3 dB

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