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Article Index
Furutech ADL Esprit preamp, DAC and ADC
Sound quality
Recording analogue
Conclusion
Measured performance
All Pages

Measurements by Rohde & Schwarz UPV, the world's most advanced audio analyser.


MEASURED PERFORMANCE
Both optical and electrical S/PDIF inputs worked up to the maximum 192kHz sample rate, giving a frequency response flat to 28kHz our analysis shows, that measures -3dB at 36kHz. a little below many rivals, but this is unlikely to be very apparent in use. High sample rate and extended bandwidth avoids in-band aliasing products and phase error.
    Distortion via S/PDIF at -60dB, 16bit, measured 0.28%  against a common value of 0.22% for most CD players and associated DACs. With 24bit distortion sank to 0.13% (96k selected on rear switch), analysis showing this comprised noise. It is possible to record 0.02% with 24bit, where noise is lower but  this is a little academic as noise with 24bit is very low in extraordinarily low in any case.
    USB gave similar results, with bandwidth to 28kHz with a 96kHz sample rate input and distortion measuring 0.15% at -60dB with 24bit resolution. This makes the USB input better than most in terms of distortion, and noise was low too at -110dB, measured with a notched out test tone. These results approach those of the Epiphany E-DAC which uses the same USB receiver chip.
    Frequency response of the preamp measured flat to 100kHz and gain was x4 (12dB). Maximum output was 7.4V so input overload occurred at 1.9V at full gain, but turning volume down avoids output stage overload.
    The ADC was very linear. Recording a 997Hz, -60dB tone then playing it back through the S/PDIF output showed just a few distortion harmonics totalling 0.22%, as well as no quantisation noise or spurious products our analysis shows. Playing back through the internal DAC increased this to 0.4%. Noise measured -100dB IEC A weighted . Frequency response of the ADC alone reached to 28kHz (-1dB) with 96k sample rate and rolled down smoothly toward the 48k limit, measuring -3dB at 36kHz.
    The Furutech Esprit is flexible and measures well. It doesn’t offer the best figures possible with 24bit through S/PDIF but its Tenor USB receiver is very linear and less noisy than most, and the on-board 24/96 ADC measured very well. It is a tightly engineered package that looks good all round under measurement. NK

Frequency response, DAC  (-1dB)
192kHz sample rate             2Hz-28kHz
ADC                                     2Hz-28kHz

Distortion S/PDIF (%)    16 / 24bit
0dB                                      0.006 / 0.006
-60dB                                   0.34 / 0.13

Separation (1kHz)               110dB
Noise (IEC A)                     -110dB
Dynamic range (EIAJ, 16/24bit)    101 / 105dB

PREAMP
Frequency response    2Hz-100kHz
Gain                                     x4
Max output                          7.4V

 

FREQUENCY RESPONSE - PREAMP

 

FREQUENCY RESPONSE - DAC, 24/192



 

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