Does the Topping DX3 Pro+ drive the Audio-Technica ATH-R70x?

Computed from rated specifications · target SPL 110 dB · load 600 Ω

Adequate

The Topping DX3 Pro+ adequately drives the Audio-Technica ATH-R70x with limited margin (~9.0 dB headroom at 600 ohms; needs ~15.8 mW, delivers 125 mW). (Amp power at 600 ohms is estimated from its published figure at a nearby load.)

Headroom
9.0 dB
Required (110 dB SPL)
15.8 mW
Delivered (@ 600 Ω)
125 mW *est.
Required voltage
2.73 Vrms

Power Headroom

Headroom: 9.0 dB 0 · target 9.0 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Scale shows dB headroom above the 15.8 mW required to reach 110 dB SPL. Amp delivers 125 mW at 600 Ω (+9.0 dB above target). Power figure estimated from an adjacent published load.

Audio-Technica ATH-R70x Dynamic · over-ear
Impedance 470.0 Ω rated
Sensitivity 98.0 dB/mW rated
Driver Dynamic
Spec basis Rated
Rated: Audio-Technica official spec (470 Ω, 98 dB/mW at 1 kHz). RAA has no measurement page. · Source ↗
Topping DX3 Pro+ Dac Amp · Single Ended
Output impedance manufacturer 0.1 Ω
Power @ 32 Ω 1800 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 DX3 Pro+ SE headphone output: 1800 mW @ 32 Ω, 250 mW @ 300 Ω (from Topping official spec). Output impedance <0.1 Ω. 600 Ω derived from 300 Ω. · Source ↗
Power figure note

The amp's power at 600 Ω was not published directly — it was derived from the voltage ceiling at a published lower-impedance load. The actual delivered power may differ modestly.

Where to buy

Topping DX3 Pro+ on Amazon ↗ Audio-Technica ATH-R70x 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 14.5 dB
Schiit Valhalla 2 Ample 14.5 dB
JDS Labs Atom Amp 2 Adequate 9.6 dB
Topping L30 Adequate 9.5 dB
iFi Zen DAC V2 Marginal 0.6 dB
Apple USB-C to 3.5mm Insufficient -10.0 dB

See all amplifiers for the Audio-Technica ATH-R70x →

HeadphoneHeadroom
Koss Porta Pro Ample 28.2 dB
Grado SR80x Ample 27.9 dB
HiFiMan Arya Ample 17.5 dB
Sennheiser HD 660S Ample 17.4 dB
Beyerdynamic DT 770 Pro 250 Adequate 8.4 dB
Beyerdynamic DT 990 Pro Adequate 7.3 dB

See all headphones for the Topping DX3 Pro+ →