Four Audio Page 1/14 DBS1. Audio Quality Measurements
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1 Four Audio Page 1/14 DBS1 Audio Quality Measurements
2 Four Audio Page 2/14 1 DBS1 Dante two channel breakout box Preamp low Gain + ADC Frequency Response Signal to Noise THD level sweep THD frequency sweep THD 1 khz DIM level sweep Preamp high Gain + ADC Frequency Response Signal to Noise THD level sweep THD frequency sweep THD 1 khz DIM level sweep DAC + analogue output stage Frequency Response Signal to Noise THD level sweep THD frequency sweep THD 1 khz... 14
3 Four Audio Page 3/14 1 DBS1 Dante two channel breakout box Fig. 1.1 Dante network setup. Dante Controller and Dante Virtual Soundcard for data stream between APx555 and DBS1 1.1 Preamp low Gain + ADC Fig. 1.2 DBS1 input setup. Input Sensitivity: +21 dbu
4 Four Audio Page 4/ Frequency Response Fig dbu sens. + AD-Converter: Frequency Response relative to 1 khz. Exciter level 0 dbu = -21 dbfs. Dotted lines with 70 Hz (6 db/oct) highpass filter. Fig dbu sens. + AD-Converter: Phase Response relative to 1 khz. Dotted lines with 70 Hz (6 db/oct) highpass filter.
5 Four Audio Page 5/ Signal to Noise Fig dbu sens. + AD-Converter: Noise spectrum 128K FFT, 48 khz sample rate. Ch1: -111(-114) dbfs(a) Ch2: -115(-117) dbfs(a) THD level sweep Fig dbu sens. + AD-Converter: THD(dotted lines) and THD+N (Ch1,Ch2) at 1 khz depending from the input level.
6 Four Audio Page 6/ THD frequency sweep Fig dbu sens. + AD-Converter: THD (Ch1,Ch2) at +10 dbu input level depending from the frequency THD 1 khz Fig dbu sens. + AD-Converter: Distortion and noise spectrum (Ch1,Ch2) at +10 dbu (= -11 dbfs) input level
7 Four Audio Page 7/ DIM level sweep Fig dbu sens. + AD-Converter: Dynamic Intermodulation Distortion (DIM) (Ch1,Ch2) depending from the input level 1.2 Preamp high Gain + ADC Fig DBS1 input setup. Input Sensitivity: -45 dbu
8 Four Audio Page 8/ Frequency Response Fig dbu sens. + AD-Converter: Frequency Response relative to 1 khz. Exciter level -60 dbu = -15 dbfs. Dotted lines with 70 Hz (6 db/oct) highpass filter. Fig dbu sens. + AD-Converter: Phase Response relative to 1 khz. Dotted lines with 70 Hz (6 db/oct) highpass filter.
9 Four Audio Page 9/ Signal to Noise Fig dbu sens. + AD-Converter: Noise spectrum 128K FFT, 48 khz sample rate. Ch1: -76(-79) dbfs(a) Ch2: -76(-79) dbfs(a) THD level sweep Fig dbu sens. + AD-Converter: THD(dotted lines) and THD+N (Ch1,Ch2) at 1 khz depending from the input level.
10 Four Audio Page 10/ THD frequency sweep Fig dbu sens. + AD-Converter: THD (Ch1,Ch2) at -48 dbu input level depending from the frequency THD 1 khz Fig dbu sens. + AD-Converter: Distortion and noise spectrum (Ch1,Ch2) at -48 dbu (= -3 dbfs) input level
11 Four Audio Page 11/ DIM level sweep Fig dbu sens. + AD-Converter: Dynamic Intermodulation Distortion (DIM) (Ch1,Ch2) depending from the input level 1.3 DAC + analogue output stage Fig DBS1 output setup. Max. output: +15 dbu
12 Four Audio Page 12/ Frequency Response Fig DA-Converter + output stage at +15 dbu max. output level: Frequency Response relative to 1 khz. Exciter level -20 dbfs = -5 dbu. Fig DA-Converter + output stage at +15 dbu max. output level: Phase Response relative to 1 khz.
13 Four Audio Page 13/ Signal to Noise Fig DA-Converter + output stage at +15 dbu max. output level: Noise spectrum 128K FFT, 48 khz sample rate. Ch1: -99(-102) dbfs(a) S/N = 114(117)dB(A) Ch2: -99(-102) dbfs(a) S/N = 114(117)dB(A) THD level sweep Fig DA-Converter + output stage at +15 dbu max. output level: (0 dbfs = +15 dbu) THD(dotted lines) and THD+N (Ch1,Ch2) at 1 khz depending from the output level.
14 Four Audio Page 14/ THD frequency sweep Fig DA-Converter + output stage at +15 dbu max. output level: THD (Ch1,Ch2) at -3 dbfs (= +12 dbu) output level depending from the frequency THD 1 khz Fig DA-Converter + output stage at +15 dbu max. output level: Distortion and noise spectrum (Ch1,Ch2) at -3 dbfs (= +12 dbu) output level
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