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Ultrasone PRO-900
Impedance 40 Ω
Efficiency 96.0 dB SPL/mW
Transducer Type Dynamic
Operating Principle Closed
Ear Coupling Over-ear
Target SPL Requirements
Target Power Voltage
90.0 dB 0.25 mW 0.1 Vrms
92.5 dB 0.45 mW 0.13 Vrms
95.0 dB 0.79 mW 0.18 Vrms
97.5 dB 1.4 mW 0.24 Vrms
100.0 dB 2.5 mW 0.32 Vrms
102.5 dB 4.5 mW 0.42 Vrms
105.0 dB 7.9 mW 0.56 Vrms
107.5 dB 14.1 mW 0.75 Vrms
110.0 dB 25.1 mW 1.0 Vrms
Price History
Current $549.95
Highest $549.95
Lowest $469.95
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Popular amps for Ultrasone PRO-900

Model Peak SPL Portable Price
FiiO E11K / A3 FiiO E11K / A3 119.3 dB $59.99
Schiit Magni Schiit Magni 125.8 dB $12.99
Schiit Magni 2 Schiit Magni 2 125.8 dB $5.99
Schiit Fulla 2 Schiit Fulla 2 120.6 dB $99.00
Schiit Fulla Schiit Fulla 119.8 dB $59.00
Schiit Magni 3 Schiit Magni 3 128.0 dB $99.00
FiiO Fujiyama E06 FiiO Fujiyama E06 115.0 dB $27.99