Benchmark DAC3 HGC - Page 57

Instruction Manual for DAC3 HGC and DAC3 L with 2.X Firmware Page 57
Graph 11 - Headphone Amplifier into 30 Ohms – THD+N versus Power
This plot shows the THD+N performance of the headphone outputs under a very heavy load (30-
Ohms). Note that the THD+N performance of the headphone outputs still approaches that of the
balanced outputs (-110 dB at 20 mW).
This graph demonstrate that Benchmark's HPA2™ headphone amplifier can cleanly deliver 1.25 W
into 30 Ohms, both channels driven.
Audio Precision
DAC3 - Headphone Amplifier - THD+N vs Power at 1 KHZ (w/20 kHz LPF unweighted)
Headphone outputs into 30 Ohms, both channels driven
DAC3 - HEADPHONE - THD+N vs Power - 30 Ohm Load.at27
ColorSweep Trace
Line Style Thick Data Axis Comment
Cursor1 Cursor2
1 1 Red Solid 4 Anlr.THD+N Ratio Left *-80.867 dB *-87.006 dB
-120
+0
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
-80.867
-87.006
d
B
100u 3 200u 500u 1m 2m 5m 10m
20m 50m 100m 200m 500m
1 2
1.253
W
dx=1.253 W
dy=-6.139 dB