Does the Schiit Valhalla 2 drive the Fostex T50RP Mk3?

Computed from measured specifications · target SPL 110 dB · load 50 Ω

Marginal OTL-compatible pairing

The Schiit Valhalla 2 marginally drives the Fostex T50RP Mk3; barely reaches target SPL (~1.7 dB headroom at 50 ohms; needs ~123.0 mW, delivers 180 mW). This OTL tube amp suits the headphone's impedance (54 Ω) — a classically compatible pairing for high-output-impedance tube sources.

Headroom
1.7 dB
Required (110 dB SPL)
123.0 mW
Delivered (@ 50 Ω)
180 mW
Required voltage
2.57 Vrms

Power Headroom

Headroom: 1.7 dB 0 · target 1.7 dB below target marginal adequate ample -14 dB +10 +20 +36 dB

Scale shows dB headroom above the 123.0 mW required to reach 110 dB SPL. Amp delivers 180 mW at 50 Ω (+1.7 dB above target).

Fostex T50RP Mk3 Planar · over-ear
Impedance (rated) 50 Ω
Impedance (measured) Source: reference-audio-analyzer.pro/en/r… 53.65 Ω measured
Sensitivity (rated) 91.0 dB/mW
Sensitivity (measured) 89.1 dB/mW measured
Driver Planar
Spec basis Measured
Measured by Reference Audio Analyzer (https://reference-audio-analyzer.pro/en/report/hp/fostex-t50rp-mk3.php) · Source ↗
Schiit Valhalla 2 Desktop Tube · Single Ended
Output impedance manufacturer 14.0 Ω
Power @ 50 Ω 180 mW
Power @ 300 Ω 800 mW
Power @ 600 Ω 450 mW
Power source Manufacturer
Schiit Valhalla 2 manufacturer spec (Audiophonics retailer, citing Schiit official): 180/800/450 mW at 50/300/600 Ω. OTL/hybrid topology: more power into 300 Ω than 50 Ω (normal for OTL). Output impedance 14 Ω (hi-gain) / 3.5 Ω (lo-gain) from Schiit PDF manual and Schiit Europe. Using 14 Ω as worst-case for damping check. · Source ↗
Impedance compatibility

This OTL tube amp's high output impedance (14 Ω) is a good match for the Fostex T50RP Mk3's 53 Ω impedance. The impedance ratio (3.8×) falls within the recommended range for high-output-impedance tube sources — a classically well-matched pairing.

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 Valhalla 2 on Amazon ↗ Fostex T50RP Mk3 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 16.9 dB
JDS Labs Atom Amp 2 Ample 13.3 dB
Topping DX3 Pro+ Ample 11.7 dB
Schiit Magni Heretic Ample 11.1 dB
Little Dot MkII Insufficient -0.9 dB
Apple USB-C to 3.5mm Insufficient -6.0 dB

See all amplifiers for the Fostex T50RP Mk3 →

HeadphoneHeadroom
Sennheiser HD 660S Ample 22.5 dB
Sennheiser HD 800 S Ample 20.6 dB
Philips SHP9500 Ample 13.6 dB
Audeze LCD-2 Classic Ample 13.6 dB
HiFiMan Edition XS Adequate 4.4 dB
AKG K240 Studio Adequate 3.6 dB

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