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Audiobot Notes
Peak SPL

121.0 dB

This was approximated from the source output at 33 Ω

Damping factor 74.1
Ultrasone PRO-750
Ultrasone PRO-750
Impedance 40 Ω
Efficiency 94.0 dB SPL/mW
Frequency Response 8 - 35,000 Hz
Transducer Type Dynamic
Operating Principle Closed
Ear Coupling On-ear
Weight 295 g
Price History
Current $265.99
Highest $389.95
Lowest $265.99
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JDS Labs Objective2
JDS Labs Objective2
Type Solid state
Output Impedance 0.54 Ω
Power Output 88 mW at 600 Ω
355 mW at 150 Ω
613 mW at 33 Ω
Frequency Range 20 - 20,000 Hz
Additional Notes
"O2 is an opensource amplifier designed by brilliant engineer NwAvGuy, with emphasis on benchmark performance and low cost. O2 arrives fully assembled, hand tested, and ready to enjoy."
Price History
Current $139.00
Highest $412.59
Lowest $139.00
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