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Benchmark MPA1 Manual de instrucciones Pagina 20

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MPA1 Instruction Manual Page 20
THD Spectrum at 1 KHz
Audio Precision
02/21/07 09:43:491 kHz FFT at 60 dB Gain, Output Level = +24 dBu, 0 dBr = +24 dBu
ColorSweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2
1 1 Red Solid 4 Fft.Ch.2 Ampl Left *-111.404 dBr A *-122.747 dBr A
-150
-100
-148
-146
-144
-142
-140
-138
-136
-134
-132
-130
-128
-126
-124
-122
-120
-118
-116
-114
-112
-110
-108
-106
-104
-102
d
B
r
A
-150
-100
-148
-146
-144
-142
-140
-138
-136
-134
-132
-130
-128
-126
-124
-122
-120
-118
-116
-114
-112
-110
-108
-106
-104
-102
-111.404
-122.747
d
B
r
A
2k 20k4k 6k 8k 10k 12k 14k 16k 18k
2.00513k3.00537k
Hz
dx=1.00024 kHz
dy=-11.343 dB
The above FFT plot shows that the MPA1 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
low. 2
nd
-harmonic distortion measures better than -111 dB. 3
rd
-harmonic distortion measures
better than -122 dB. Note the absence of higher-order harmonics.
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