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Audiobot Notes
Peak SPL

124.3 dB

This was approximated from the source output at 60 Ω

Damping factor
Superlux HD-668B
Superlux HD-668B
Impedance 56 Ω
Efficiency 98.0 dB SPL/mW
Frequency Response 10 - 30,000 Hz
Transducer Type Dynamic
Operating Principle Open
Ear Coupling Over-ear
Price History
Current $44.80
Highest $69.99
Lowest $44.80
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Type Tube
Power Output 480 mW at 600 Ω
640 mW at 300 Ω
550 mW at 120 Ω
400 mW at 60 Ω
310 mW at 32 Ω
Frequency Range 8 - 100,000 Hz
Additional Notes
Single ended, OTL. Power outputs with 6080 tubes.
Price History
Current $1,190.00
Highest $1,190.00
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