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Impedance 32 Ω
Efficiency 97.0 dB SPL/mW
Target SPL Requirements
Target Power Voltage
90.0 dB 0.2 mW 0.08 Vrms
92.5 dB 0.35 mW 0.11 Vrms
95.0 dB 0.63 mW 0.14 Vrms
97.5 dB 1.1 mW 0.19 Vrms
100.0 dB 2.0 mW 0.25 Vrms
102.5 dB 3.5 mW 0.34 Vrms
105.0 dB 6.3 mW 0.45 Vrms
107.5 dB 11.2 mW 0.6 Vrms
110.0 dB 20.0 mW 0.8 Vrms
Price History
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Popular amps for Koss UR 20

Model Peak SPL Portable Price
FiiO E10K FiiO E10K 120.0 dB $71.30
Electric Avenues PA2V2 Electric Avenues PA2V2 120.0 dB $70.00
FiiO E11K / A3 FiiO E11K / A3 121.3 dB $59.99
Schiit Magni Schiit Magni 127.8 dB $12.99
FiiO Andes E07K FiiO Andes E07K 120.4 dB $8,876.70
Schiit Magni 2 Schiit Magni 2 127.8 dB $5.99
Schiit Fulla 2 Schiit Fulla 2 122.6 dB $99.00