Technical Specifications
All specifications are typical performance unless otherwise noted. All specifications are
subject to change at any time. Tested with Audio Precision APx555.
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
<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
