Does the Little Dot MkII drive the Drop + Sennheiser HD 6XX?

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

Ample

The Little Dot MkII drives the Drop + Sennheiser HD 6XX with ample headroom (~12.5 dB headroom at 300 ohms; needs ~16.7 mW, delivers 300 mW). Note: output impedance for this amp isn't reliably published, so the damping interaction into this 300 Ω load can't be assessed; treat low-impedance pairings with caution.

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

Power Headroom

Headroom: 12.5 dB 0 · target 12.5 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 300 mW at 300 Ω (+12.5 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 ↗
Little Dot MkII Desktop Tube · Single Ended
Output impedance assumed Not published
Power @ 32 Ω 100 mW
Power @ 120 Ω 200 mW
Power @ 300 Ω 300 mW
Power @ 600 Ω 150 mW *est.
Power source Manufacturer low confidence
* 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.
Little Dot MkII SEPP OTL circuit. Power figures (100/200/300 mW at 32/120/300 Ω) appear consistently across retailer listings (Linsoul, ShenZhenAudio) citing manufacturer spec. Note unusual characteristic: more power into 300 Ω than 32 Ω — typical for OTL amps. Output impedance not published; SEPP OTL topology suggests ~20–50 Ω but no reputable non-forum measurement found. Set null; damping check flagged as indeterminate. 600 Ω derived from 300 Ω. · Source ↗
Impedance — unknown output impedance

This amp's output impedance is not reliably published, so the damping interaction into this 300 Ω headphone cannot be assessed. Treat low-impedance pairings (below ~80 Ω) with caution.

Specification confidence: low

One or more amp specifications (power output or output impedance) are estimated rather than published by the manufacturer. Treat this pairing's verdict as approximate.

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

Little Dot MkII 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.

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Schiit Valhalla 2 Ample 16.8 dB
Topping L30 Ample 12.2 dB
Topping A90 Ample 11.7 dB
iFi Zen DAC V2 Adequate 3.3 dB
Apple USB-C to 3.5mm Insufficient -7.0 dB

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Sennheiser HD 660S Ample 18.2 dB
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AKG K240 Studio Marginal 1.0 dB
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