Does the FiiO K7 drive the Beyerdynamic DT 990 Pro?

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

Adequate

The FiiO K7 adequately drives the Beyerdynamic DT 990 Pro with limited margin (~4.8 dB headroom at 300 ohms; needs ~46.2 mW, delivers 140 mW).

Headroom
4.8 dB
Required (110 dB SPL)
46.2 mW
Delivered (@ 300 Ω)
140 mW
Required voltage
3.52 Vrms

Power Headroom

Headroom: 4.8 dB 0 · target 4.8 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Scale shows dB headroom above the 46.2 mW required to reach 110 dB SPL. Amp delivers 140 mW at 300 Ω (+4.8 dB above target).

Beyerdynamic DT 990 Pro Dynamic · over-ear
Impedance (rated) 250 Ω
Impedance (measured) Source: reference-audio-analyzer.pro/en/r… 267.6 Ω measured
Sensitivity (rated) 96.0 dB/mW
Sensitivity (measured) 93.35 dB/mW measured
Driver Dynamic
Spec basis Measured
Measured by Reference Audio Analyzer (https://reference-audio-analyzer.pro/en/report/hp/beyerdynamic-dt-990-pro-250.php) · Source ↗
FiiO K7 Dac Amp · Single Ended
Output impedance manufacturer 1.0 Ω
Power @ 32 Ω 1220 mW
Power @ 300 Ω 140 mW
Power @ 600 Ω 70 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.
FiiO K7 SE headphone output from manufacturer spec page (fiio.com/k7_parameters): L+R ≥ 1220 mW+1220 mW @ 32 Ω, L+R ≥ 140 mW+140 mW @ 300 Ω (THD+N<1%). Output impedance <1 Ω @ 32 Ω from manufacturer. 600 Ω derived from 300 Ω. · Source ↗

Where to buy

FiiO K7 on Amazon ↗ Beyerdynamic DT 990 Pro 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 12.9 dB
Schiit Valhalla 2 Ample 12.4 dB
JDS Labs Atom Amp 2 Adequate 7.9 dB
Topping L30 Adequate 7.8 dB
iFi Zen DAC V2 Insufficient -1.1 dB
Apple USB-C to 3.5mm Insufficient -11.5 dB

See all amplifiers for the Beyerdynamic DT 990 Pro →

HeadphoneHeadroom
Koss Porta Pro Ample 26.5 dB
Grado SR80x Ample 26.2 dB
HiFiMan Arya Ample 15.8 dB
AKG K702 Ample 15.2 dB
Audio-Technica ATH-R70x Adequate 6.5 dB
Beyerdynamic DT 770 Pro 250 Adequate 5.9 dB

See all headphones for the FiiO K7 →