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Audiobot Notes
Peak SPL

133.4 dB

Damping factor 106.7
Polk UltraFocus 8000
Polk UltraFocus 8000
Impedance 32 Ω
Efficiency 110.0 dB SPL/mW
Frequency Response 8 - 28,000 Hz
Transducer Type Dynamic
Operating Principle Closed
Ear Coupling On-ear
Additional Notes
Active noise cancellation
Price History
Current $350.00
Highest $582.59
Lowest $350.00
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FiiO Alpen E17
FiiO Alpen E17
Output Impedance 0.3 Ω
Power Output 220 mW at 32 Ω
290 mW at 16 Ω
Frequency Range 10 - 500,000 Hz
Portable
Price History
Current $129.00
Highest $745.13
Lowest $129.00
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