Does the Schiit Fulla 4 drive the HiFiMan Sundara?

Computed from measured specifications · target SPL 110 dB · load 32 Ω

Adequate

The Schiit Fulla 4 adequately drives the HiFiMan Sundara with limited margin (~5.7 dB headroom at 32 ohms; needs ~54.3 mW, delivers 200 mW).

Headroom
5.7 dB
Required (110 dB SPL)
54.3 mW
Delivered (@ 32 Ω)
200 mW
Required voltage
1.46 Vrms

Power Headroom

Headroom: 5.7 dB 0 · target 5.7 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Scale shows dB headroom above the 54.3 mW required to reach 110 dB SPL. Amp delivers 200 mW at 32 Ω (+5.7 dB above target).

HiFiMan Sundara Planar · over-ear
Impedance (rated) 37 Ω
Impedance (measured) Source: reference-audio-analyzer.pro/en/r… 39.25 Ω measured
Sensitivity (rated) 94.0 dB/mW
Sensitivity (measured) 92.65 dB/mW measured
Driver Planar
Spec basis Measured
Measured by Reference Audio Analyzer (https://reference-audio-analyzer.pro/en/report/hp/hifiman-sundara.php) · Source ↗
Schiit Fulla 4 Dac Amp · Single Ended
Output impedance manufacturer 0.5 Ω
Power @ 16 Ω 300 mW
Power @ 32 Ω 200 mW
Power @ 50 Ω 150 mW
Power @ 300 Ω 40 mW
Power @ 600 Ω 20 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.
Schiit Fulla 4 manufacturer spec: 300/200/150/40 mW at 16/32/50/300 Ω. NOTE: prior project fixture used 400/300/220/40 — those figures match the Fulla 3 or an earlier revision; updated to Fulla 4 (current product). Output impedance from Schiit spec. · Source ↗
Planar driver note

Planar-magnetic headphones can have high current demands that are not fully captured by the power headroom model. Even with adequate headroom, some solid-state amps may struggle to deliver sufficient peak current for transient dynamics. Prefer amps rated for low-impedance planars.

Where to buy

Schiit Fulla 4 on Amazon ↗ HiFiMan Sundara 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 20.4 dB
Schiit Asgard 3 Ample 18.1 dB
Drop THX AAA 789 Ample 15.2 dB
Topping DX3 Pro+ Ample 15.2 dB
Little Dot MkII Marginal 2.7 dB
Apple USB-C to 3.5mm Insufficient -2.4 dB

See all amplifiers for the HiFiMan Sundara →

HeadphoneHeadroom
Grado SR80x Ample 18.3 dB
AKG K371 Ample 17.8 dB
Beyerdynamic DT 770 Pro 80 Adequate 8.0 dB
HiFiMan Arya Adequate 8.0 dB
Beyerdynamic DT 770 Pro 250 Marginal 0.5 dB
Beyerdynamic DT 990 Pro Insufficient -0.6 dB

See all headphones for the Schiit Fulla 4 →