Benchmark MPA1 Manual de instrucciones descargar pdf (Pagina 24)

PRE420 Instruction Manual – rev. E Page 24

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

-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

2k 20k4k 6k 8k 10k 12k 14k 16k 18k

2.00513k3.00537k

dx=1.00024 kHz

dy=-11.343 dB

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

low. 2

-harmonic distortion measures better than -111 dB. 3

-harmonic distortion measures

better than -122 dB. Note the absence of higher-order harmonics.

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 36 37

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Benchmark MPA1 Manual de instrucciones Pagina 24

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