Benchmark DAC2 Series - Page 50

DAC2 Series Instruction Manual Rev C Page 50
A
udio Precision DAC2 - THD VS FREQ AT 0 dBFS
Balanced Outputs
DAC2 - EVEN AND ODD THD vs FREQUENCY.at27
ColorSweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2
1 1 Green Solid 4 Distortion.Ch.1 Harm Sum1 Ratio Left *-115.210 dB *-112.066 dB
1 2 Red Solid 4 Distortion.Ch.1 Harm Sum2 Ratio Right -115.165 dB -120.544 dB
GREEN = EVEN HARMONIC DISTORTION (2,4,6,8,10,12,14)
RED = ODD HARMONIC DISTORTION (3,5,7,9,11,13,15)
-130
-90
-125
-120
-115
-110
-105
-100
-95
d
B
-130
-90
-125
-120
-115
-110
-105
-100
-95
-115.21
-112.066
d
B
20 10k 50 100 200 500 1k 2k 5k
1.00318k 10k
Hz
dx=8.99682 kHz d
y
=+3.144 dB
Graph Plot 11 - EVEN AND ODD THD vs. FREQUENCY
This plot demonstrates that the harmonic distortion of the DAC2 is lower than the THD+N numbers
would suggest. This plot shows THD not THD+N. Even and odd harmonic distortions are plotted
separately. Note that odd harmonics are lower than the more "musical" even harmonics. Both
sets of harmonics are very low in amplitude (-112 dB to -120 dB), and should be entirely inaudible.