BE36 Posted November 9, 2010 Share Posted November 9, 2010 Can someone who understands more about electronics explain how the Moon 300D can be rated at 116 dB for Dynamic range but the DAC, Burr Brown PCM1793, it uses is rated at 113 Dynamic Range by it's manufacturer, Texas Instruments? From Moon 300D Specs: pe Solid State Front Panel Controls Standby / Input Selector LED Indicators Locked Sampling Frequency / Input Digital Input Types S/PDIF (RCA) x 2 USB x 1 TosLink x 1 Digital Input Impedance S/PDIF 75 Ω @ 0.5 Volts DAC / Digital Filter BurrBrown PCM1793 Bit-depth range - S/PDIF, Toslink 16 - 24 bits Bit-depth range - USB 16 bits Sampling Frequency Rate range - S/PDIF, Toslink 32, 44.1, 48, 88.2, 96, 176.4 and 192kHz Sampling Frequency Rate range - USB 32 - 48kHz Frequency Response (audible) 20Hz - 20kHz +0/-0.2dB Frequency Response (full range) 2Hz - 72kHz +0/-3dB THD @ 1kHz, 0dBFS (A-weighted) < 0.001 % IMD < 0.004 % Dynamic Range > 116dB Signal-to-noise ratio > 115dB @ full output From Texas Instrument Specs SLES076A − MARCH 2003 − REVISED JANUARY 2004 24??BIT, 192??kHz SAMPLING, ADVANCED SEGMENT, AUDIO STEREO DIGITAL??TO??ANALOG CONVERTERFEATURES D 24-Bit ResolutionD Analog Performance: Dynamic Range: 113 dB − THD+N: 0.001% − Full-Scale Output: 2.1 V rms (atPostamplifier) D Differential Voltage Output: 3.2 V p-pD 8× Oversampling Digital Filter: − Stop-Band Attenuation: –82 dB − Pass-Band Ripple: ±0.002 dBD Sampling Frequency: 10 kHz to 200 kHz D System Clock: 128, 192, 256, 384, 512, or768 fS With AutodetectD Accepts 16-, 20-, and 24-Bit Audio DataD Data Formats: Standard, I2S, and Left-JustifiedD Digital De-EmphasisD Soft MuteD Zero Flags for Each OutputD Dual Supply Operation: − 5-V Analog, 3.3-V Digital Quote Link to comment Share on other sites More sharing options...
jacksonbart Posted November 9, 2010 Share Posted November 9, 2010 They're optimistic Quote Link to comment Share on other sites More sharing options...
BE36 Posted November 10, 2010 Author Share Posted November 10, 2010 YOu alsways make laugh and explain something at the same time . . . Quote Link to comment Share on other sites More sharing options...
Don Richard Posted November 10, 2010 Share Posted November 10, 2010 Contact the manufacturer's marketing department. These are the guys who make this stuff up. Quote Link to comment Share on other sites More sharing options...
mark1101 Posted November 10, 2010 Share Posted November 10, 2010 A part only has to "make" spec. It could be much better than its rating when measured. The measured system response could be 116 as stated. Quote Link to comment Share on other sites More sharing options...
jtnfoley Posted November 10, 2010 Share Posted November 10, 2010 A part only has to "make" spec. It could be much better than its rating when measured. The measured system response could be 116 as stated. It's also not uncommon for electronic parts to be "screened" for performace, temperature rating, etc. I don't know if the identified component maker is screening, but it's possible. Extreme example on a large piece of Silicon: Google reportedly has Intel screen parts for higher temperature ratings so their data centers can be run hotter and thereby save in cooling cost. Quote Link to comment Share on other sites More sharing options...
BE36 Posted November 10, 2010 Author Share Posted November 10, 2010 I know for piston powered aircraft engines that 95% percent of engines manufactured have meet the rated power. So an "Average" engine that is rated at 300HP is closer to 315 HP. I thought maybe Burr Brown does something similiar, or as suggested Moon might do some screening and have all the other components be really good? Or maybe it is "Marketing"? Quote Link to comment Share on other sites More sharing options...
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