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Superlux HD-661
Impedance 68 Ω
Efficiency 102.0 dB SPL/mW
Frequency Response 10 - 20,000 Hz
Transducer Type Dynamic
Operating Principle Closed
Ear Coupling Over-ear
Target SPL Requirements
Target Power Voltage
90.0 dB 0.06 mW 0.07 Vrms
92.5 dB 0.11 mW 0.09 Vrms
95.0 dB 0.2 mW 0.12 Vrms
97.5 dB 0.35 mW 0.16 Vrms
100.0 dB 0.63 mW 0.21 Vrms
102.5 dB 1.1 mW 0.28 Vrms
105.0 dB 2.0 mW 0.37 Vrms
107.5 dB 3.5 mW 0.49 Vrms
110.0 dB 6.3 mW 0.66 Vrms
Price History
Current $33.11
Highest $83.33
Lowest $33.11
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Popular amps for Superlux HD-661

Model Peak SPL Portable Price
Electric Avenues PA2V2 Electric Avenues PA2V2 121.7 dB $70.00
FiiO E5 FiiO E5 117.5 dB $20.00
FiiO E11K / A3 FiiO E11K / A3 123.0 dB $59.99
FiiO E11 FiiO E11 116.5 dB $179.99
FiiO Fujiyama E06 FiiO Fujiyama E06 118.7 dB $27.99
SMSL SAP-5 SMSL SAP-5 119.9 dB $49.99
SMSL SAP-4 SMSL SAP-4 121.7 dB $61.99