Thd Spectrum At 10 Khz - Benchmark PRE420 Instruction Manual

THD Spectrum at 10 KHz

Audio Precision
dx=10.0073 kHz
-100
-102
-104
-106
-108
-109.271
-110
-112
-114
-116
-118
-118.787
-120
-122
d
-124
B
r
-126
A
-128
-130
-132
-134
-136
-138
-140
-142
-144
-146
-148
-150
2k 4k
Sweep Trace Color
1 1 Red
The above FFT plot shows that the PRE420 has very little harmonic distortion at high frequencies.
The 10 kHz test tone is notched out with a THD analyzer to improve the resolution of the test. The
nd
20-kHz 2 -harmonic distortion measures better than -109 dB. The 30-kHz 3
measures better than -118 dB.
PRE420 Instruction Manual – rev. E
10 kHz FFT at 60 dB Gain, Output Level = +24 dBu, 0 dBr = +24 dBu
dy=-9.515 dB
6k 8k 10k 12k
Line Style Thick Data
Solid 4 Fft.Ch.2 Ampl
20.022k
14k 16k 18k
Hz
Axis Comment Cursor1
Left *-109.271 dBr A
20k 22k 24k 26k
Cursor2
*-118.787 dBr A
rd
-harmonic distortion
02/19/07 11:09:30
30.0293k
28k 30k 32k
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