Thd Spectrum At 1 Khz - Benchmark PRE420 Instruction Manual

THD Spectrum at 1 KHz

Audio Precision
dx=1.00024 kHz
-100
-102
-104
-106
-108
-110
-111.404
-112
-114
-116
-118
-120
-122
-122.747
d
-124
B
r
-126
A
-128
-130
-132
-134
-136
-138
-140
-142
-144
-146
-148
-150
2.00513k 3.00537k
2k
Sweep Trace Color
1 1 Red
The above FFT plot shows that the PRE420 has very little harmonic distortion. The 1 kHz test tone
is notched out with a THD analyzer to improve the resolution of the test. Distortion is exceptionally
nd
low. 2 -harmonic distortion measures better than -111 dB. 3
better than -122 dB. Note the absence of higher-order harmonics.
PRE420 Instruction Manual – rev. E
1 kHz FFT at 60 dB Gain, Output Level = +24 dBu, 0 dBr = +24 dBu
dy=-11.343 dB
4k 6k 8k
Line Style Thick Data
Solid 4 Fft.Ch.2 Ampl
10k 12k
Hz
Axis Comment Cursor1
Left *-111.404 dBr A
14k 16k
Cursor2
*-122.747 dBr A
rd
-harmonic distortion measures
02/21/07 09:43:49
-100
-102
-104
-106
-108
-110
-112
-114
-116
-118
-120
-122
d
-124
B
r
-126
A
-128
-130
-132
-134
-136
-138
-140
-142
-144
-146
-148
-150
18k 20k
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