Does the Schiit Magnius drive the Sennheiser HD 650?

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

Ample

The Schiit Magnius drives the Sennheiser HD 650 with ample headroom (~15.1 dB headroom at 300 ohms; needs ~9.2 mW, delivers 300 mW).

Headroom
15.1 dB
Required (110 dB SPL)
9.2 mW
Delivered (@ 300 Ω)
300 mW
Required voltage
1.78 Vrms

Power Headroom

Headroom: 15.1 dB 0 · target 15.1 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Scale shows dB headroom above the 9.2 mW required to reach 110 dB SPL. Amp delivers 300 mW at 300 Ω (+15.1 dB above target).

Sennheiser HD 650 Dynamic · over-ear
Impedance (rated) 300 Ω
Impedance (measured) Source: reference-audio-analyzer.pro/en/r… 344.9 Ω measured
Sensitivity (rated) 97.77 dB/mW
Sensitivity (measured) 100.35 dB/mW measured
Driver Dynamic
Spec basis Measured
Measured by Reference Audio Analyzer (https://reference-audio-analyzer.pro/en/report/hp/sennheiser-hd-650.php) · Source ↗
Schiit Magnius Desktop Ss · Single Ended
Output impedance manufacturer 0.1 Ω
Power @ 32 Ω 2000 mW
Power @ 300 Ω 300 mW
Power @ 600 Ω 150 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 Magnius SE output: 2000 mW @ 32 Ω, 300 mW @ 300 Ω (both at 1% THD, per Schiit spec). Balanced output is substantially higher. 600 Ω derived from 300 Ω voltage ceiling. · Source ↗

Where to buy

Schiit Magnius on Amazon ↗ Sennheiser HD 650 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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Topping L30 Ample 14.8 dB
Topping A90 Ample 14.3 dB
iFi Zen DAC V2 Adequate 5.9 dB
Apple USB-C to 3.5mm Insufficient -4.5 dB

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