Wideband Thd+N Vs. Frequency - Benchmark PRE420 Instruction Manual

Wideband THD+N vs. Frequency

Measurement Bandwidth = 10 Hz to 500 kHz, Gain = 30 to 60 dB, Output Level = +4 dBu
Audio Precision
-60
-62
-64
-66
-68
-70
-72
-74
-76
-78
d
-80
B
-82
-84
-86
-88
-90
-92
-94
-96
-98
-100
20 50
Sweep Trace Color
1 1 Red
2 1 Magenta
3 1 Blue
4 1 Green
This graph shows that THD+N does not rise above noise – even at very high frequencies. The 500
kHz measurement bandwidth elevates the noise by 28 dB relative to a 20 kHz measurement
bandwidth.
PRE420 Instruction Manual – rev. E
PRE420 - Wideband THD+N vs Frequency, BW=500 kHz
100 200 500
Line Style Thick Data
Solid 4 Anlr.THD+N Ratio
Solid 4 Anlr.THD+N Ratio
Solid 4 Anlr.THD+N Ratio
Solid 4 Anlr.THD+N Ratio
1k 2k 5k
Hz
Axis Comment
Left 60 dB Gain (top trace)
Left 50 dB Gain
Left 40 dB Gain
Left 30 dB Gain (bottom trace)
10k 20k 50k
02/19/07 16:16:11
0.1
0.05
0.02
0.01
%
0.005
0.002
0.001
100k 200k
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