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Ultrasone PRO-550
Impedance 64 Ω
Efficiency 102.0 dB SPL/mW
Transducer Type Dynamic
Operating Principle Closed
Ear Coupling On-ear
Target SPL Requirements
Target Power Voltage
90.0 dB 0.06 mW 0.06 Vrms
92.5 dB 0.11 mW 0.08 Vrms
95.0 dB 0.2 mW 0.11 Vrms
97.5 dB 0.35 mW 0.15 Vrms
100.0 dB 0.63 mW 0.2 Vrms
102.5 dB 1.1 mW 0.27 Vrms
105.0 dB 2.0 mW 0.36 Vrms
107.5 dB 3.5 mW 0.48 Vrms
110.0 dB 6.3 mW 0.64 Vrms
Price History
Current $139.99
Highest $229.95
Lowest $139.99
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Popular amps for Ultrasone PRO-550

Model Peak SPL Portable Price
Electric Avenues PA2V2 Electric Avenues PA2V2 122.0 dB $70.00
FiiO E11K / A3 FiiO E11K / A3 123.3 dB $59.99
FiiO Andes E07K FiiO Andes E07K 122.4 dB $8,876.70
FiiO Fujiyama E06 FiiO Fujiyama E06 119.0 dB $27.99
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Schiit Fulla Schiit Fulla 124.4 dB $59.00
FiiO E5 FiiO E5 117.7 dB $20.00