Does the Topping L30 drive the Sennheiser HD 660S?

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

Ample

The Topping L30 drives the Sennheiser HD 660S with ample headroom (~17.9 dB headroom at 300 ohms; needs ~4.5 mW, delivers 280 mW).

Headroom
17.9 dB
Required (110 dB SPL)
4.5 mW
Delivered (@ 300 Ω)
280 mW
Required voltage
0.99 Vrms

Power Headroom

Headroom: 17.9 dB 0 · target 17.9 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Scale shows dB headroom above the 4.5 mW required to reach 110 dB SPL. Amp delivers 280 mW at 300 Ω (+17.9 dB above target).

Sennheiser HD 660S Dynamic · over-ear
Impedance (rated) 150 Ω
Impedance (measured) Source: reference-audio-analyzer.pro/en/r… 216.75 Ω measured
Sensitivity (rated) 104.0 dB/mW
Sensitivity (measured) 103.45 dB/mW measured
Driver Dynamic
Spec basis Measured
Measured by Reference Audio Analyzer (https://reference-audio-analyzer.pro/en/report/hp/sennheiser-hd-660s.php) · Source ↗
Topping L30 Desktop Ss · Single Ended
Output impedance manufacturer 0.1 Ω
Power @ 32 Ω 2300 mW
Power @ 300 Ω 280 mW
Power @ 600 Ω 140 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.
Manufacturer-rated: 2300 mW @ 32 Ω (The Headphone List review spec table, THD+N<0.1%), 280 mW @ 300 Ω (multiple sources). 600 Ω derived from 300 Ω voltage ceiling. Output impedance <0.1 Ω from manufacturer. · Source ↗

Where to buy

Topping L30 on Amazon ↗ Sennheiser HD 660S 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 23.0 dB
Schiit Valhalla 2 Ample 22.5 dB
Little Dot MkII Ample 18.2 dB
Topping A90 Ample 17.4 dB
iFi Zen DAC V2 Adequate 9.0 dB
Apple USB-C to 3.5mm Insufficient -1.4 dB

See all amplifiers for the Sennheiser HD 660S →

HeadphoneHeadroom
Koss Porta Pro Ample 29.2 dB
Grado SR80x Ample 28.9 dB
HiFiMan Arya Ample 18.6 dB
AKG K702 Ample 18.0 dB
Beyerdynamic DT 770 Pro 250 Adequate 8.9 dB
Beyerdynamic DT 990 Pro Adequate 7.8 dB

See all headphones for the Topping L30 →