Does the Schiit Fulla 4 drive the Drop + Sennheiser HD 6XX?

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

Adequate

The Schiit Fulla 4 adequately drives the Drop + Sennheiser HD 6XX with limited margin (~3.8 dB headroom at 300 ohms; needs ~16.7 mW, delivers 40 mW).

Headroom
3.8 dB
Required (110 dB SPL)
16.7 mW
Delivered (@ 300 Ω)
40 mW
Required voltage
2.24 Vrms

Power Headroom

Headroom: 3.8 dB 0 · target 3.8 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Scale shows dB headroom above the 16.7 mW required to reach 110 dB SPL. Amp delivers 40 mW at 300 Ω (+3.8 dB above target).

Drop + Sennheiser HD 6XX Dynamic · over-ear
Impedance 300.0 Ω rated
Sensitivity 97.77 dB/mW rated
Driver Dynamic
Spec basis Rated low confidence
Electrically equivalent to Sennheiser HD 650 (same driver assembly). Rated specs derived from HD 650 manufacturer documentation. No RAA measurement page for this Drop collab. · 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 ↗
Headphone specification confidence: low

The headphone's rated specifications are from estimated or secondary sources. Measured figures (where present) are more reliable.

Where to buy

Schiit Fulla 4 on Amazon ↗ Drop + Sennheiser HD 6XX 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 17.3 dB
Schiit Valhalla 2 Ample 16.8 dB
JDS Labs Atom Amp 2 Ample 12.3 dB
Topping L30 Ample 12.2 dB
iFi Zen DAC V2 Adequate 3.3 dB
Apple USB-C to 3.5mm Insufficient -7.0 dB

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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

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