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Blue 245 is a stereo 20 bit Analogue to Digital convertor with external synchronising facilities and bargraph peak metering. Blue 245 20 Bit A–D Convertor Input sensitivity: -14dBu to +4dBu Input Impedance: >5kΩ Noise: Better than -85dB below +4dBu output level. Distortion: 0.003% (20Hz to 20kHz) Fixed Sample Frequencies: 32kHz, 44.1kHz, 48kHz Variable Sample Frequencies: Continuously variable between 28kHz and 54kHz, locked to external word clock signal. Dither 16/20bit: Triangular Probability Density Function, high pass filtered, with inversion between channels. AES Output Output Impedance: 110Ω Output level: 5Vp-p (110Ω load) DC Offset : <50mV Jitter: <1.6nS @ 48kHz Toslink Output Output Level Sensitivity: 200mV p-p External Synchronisation AES, Wordclock Input Impedance: 110Ω (AES), 75Ω (Wordclock) Input Sensitivity: 5Vp-p (AES), 5Vp-p (Wordclock)


Evaluating AD/DA loops by means of Audio Diffmaker is just what it does. Nobody 's perfect.jummpp List updated with a result from a Forsell MDAC-4 and a Focusrite Blue 245 provided by funkakunchi on the French forum Pragmatic Audio. It is the third best performance behind the MSB and ReQuest Audio converters. I have put the measurement got in Matlab but...

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Focusrite Blue AD 245:

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Evaluating AD/DA loops by means of Audio Diffmaker

...(R) Separate converters Synchronised mode ('master' indicates which converter delivers the master clock when the information is available.) Forssell MDAC-4 ----> Focusrite Blue 245 master, (funkakuchi on Pragmatic Audio = funka on Gearslutz) Focusrite sensitivity 0 dBFS = 16 dBu 0,1 dB (L), 0,0 dB (R) Corr Depth: 64.7 dB (L), 65.7 dB (R) Difference: -77.1 dBFS (L)...

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