Headphone Amplifier (High Power Mode)
Test Signal Path: APx555 (Line Out) - Input 1-2 - Headphone Output - APx555 (Line In)
Max Input Level: +28dBu
Input Impedance: 44 kOhms
Frequency Response:
-0.5dB, <1.2Hz to >200kHz
• -1dB, <0.8Hz to >250kHz

THD:
• <0.0017% (-95dB) @ +20dBu, 1kHz, A-weighted, 300 Ohm load
• 7<0.0005% (-105dB) @ +6dBu, 1kHz, A-weighted, 100 kOhm load
THD+N:
• <0.0018% (-94.8dB) @ +20dBu, 1kHz, A-weighted, 300 Ohm load
• <0.0012% (-98.4dB) @ +14dBu, 1kHz, A-weighted, 100 kOhm load
• <0.0009% (-100.4dB) @ +6dBu, 1kHz, A-weighted, 100 kOhm load
Output Impedance: 0.33 Ohms
Output Wattage:
• 252mW x 2 @ 600 Ohms, 1kHz
• 502mW x2 @ 300 Ohms, 1kHz
• 950mW x 2 @ 100 Ohms, 1kHz
• 470mW x 2 @ 32 Ohms, 1kHz
Dynamic Range:
• 114.7dB A-weighted, AES17 method, 20Hz - 20kHz, 600 Ohm load
• 116.5dB A-weighted, AES17 method, 20Hz - 20kHz, 100 kOhm load
Noise Floor:
• -97.5dBu A-weighted, 20Hz - 20kHz,  32-100 kOhm load
• -99.9dBV A-weighted, 20Hz - 20kHz,  32-100 kOhm load

Headphone Amplifier (Low Power Mode)
Test Signal Path: APx555 (Line Out) - Input 1-2 - Headphone Output - APx555 (Line In)
Max Input Level: +21.7dBu
Input Impedance: 44 kOhms
Frequency Response:
• -0.5dB, <1.2Hz to >200kHz
• -1dB, <0.8Hz to >250kHz
THD: <0.0002% (-114dB) @ +6dBu, 1kHz, A-weighted, 100 kOhm load
THD+N:
• <0.00045% (-107dB) @ +14dBu, 1kHz, A-weighted, 100 kOhm load
• <0.0008% (-102dB) @ +6dBu, 1kHz, A-weighted, 100 kOhm load
Output Impedance: 1 Ohms
Output Wattage:
• 46mW x 2 @ 600 Ohms, 1kHz
• 73mW x2 @ 300 Ohms, 1kHz
• 112W x 2 @ 100 Ohms, 1kHz
• 71mW x 2 @ 32 Ohms, 1kHz
Dynamic Range:
• 110.1dB A-weighted, AES17 method, 20Hz - 20kHz, 600 Ohm load
• 112.9dB A-weighted, AES17 method, 20Hz - 20kHz, 100 kOhm load
Noise Floor:
• -100dBu A-weighted, 20Hz - 20kHz, 32-100 kOhm load
• -102.3dBV A-weighted, 20Hz - 20kHz,  32-100 kOhm load

Power Consumption
All power consumption measurements are estimates. Actual power consumption will vary depending on headphone impedance/sensitivity, source material and it’s frequency content, as well as overall headphone volume. 
Current Consumption: 
• 110 mA idle, 390 mA peak, High Power
• 30 mA idle, 80 mA peak, Low Power
Average Battery Life:
• ~ 2h (High Power)
• ~ 9h 30m (Low Power)
Battery Low Indicator Threshold: 6.8v
Unit Off Threshold: 3v

Real-World Battery Life Tests
Actual battery life will vary depending on battery type being used, headphone impedance/sensitivity, source material and it’s frequency content, as well as overall headphone volume. 
Test Signal Path: 500ADAT C.A.S.T. Input - N22H C.A.S.T. Output - Headphone Output
Audio Technica ATH-M50x (38Ω): 
• 1h = Battery Low Indicator, 2h = Unit Off (High Power Mode, Max Volume, Energizer Max Battery) 
• 8h 10m = Battery Low Indicator, 10h 25m = Unit Off (Low Power Mode, Max Volume, Energizer Max Battery) 
Shure SE215 (17Ω):
• 45m = Battery Low Indicator, 1h 44m = Unit Off (High Power Mode, Max Volume, Duracell Plus Battery) 
• 7h = Battery Low Indicator On, 9h = Unit Off (Low Power Mode, Max Volume, Duracell Plus Battery)

Power Adapter Requirements
AC Requirements: 100V – 240V AC, 50 – 60 Hz
Adapter Requirements:
• 9v, 500mA, DC (Centre Negative), (Included Supply)
• 9v, 1000mA, DC (Centre Negative), (3rd Party Supply)

Environmental
Operating Temperature: +1 to 35 degrees Celsius
Storage Conditions: -20 to 50 degrees Celsius

Dims/Weights
Unit
Width: 150mm (5.9”)
Height: 46mm (2.2")
Depth: 120mm (4.7")
Unit Weight: 0.91kg (2lb)
Shipping Carton
Width: 250mm (9.8")
Height: 120mm (4.7")
Depth: 200mm (7.9")
Carton Weight: 1.4kg (3.1lb)

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