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Prism Callia
p2
p3 Sound Quality
p4 Conclusion
p5 Measured Performance
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Rhode & Schwarz UPV audio analyser used for all tests.

 

MEASURED PERFORMANCE

The Callia uses a Cirrus Logic CS4398 DAC that offers 120dB dynamic range in Cirrus Logic specs, 115dB in Prism’s specs and 116dB under measurement, from its balanced XLR output. From the unbalanced phono socket outputs this figure fell to 115dB. The performance was maintained with S/PDIF input and USB. 

   This puts Callia in the mid-range, as it were, of current hi-fi digital convertors, with regard to this critical specification. So in terms of dynamic range it offers a good result, but both the Audiolab M-DAC+ (122dB) and Chord Mojo (125dB) manage significantly better.

   Distortion at -60dB was very low with 24bit, measuring 0.035% as our analysis shows and this was largely noise rather than true distortion residuals. With CD (16bit) the result was 0.22% as usual, this being from quantisation noise intrinsic to 16bit’s inadequate resolution.

   Frequency response reached 55kHz (-1dB) with 192kHz sample rate material, falling away above this to the 96kHz upper limit, as a our analysis shows. The TOSLINK optical input accepted 192kHz sample rate, where many others still do not, allowing Callia to work with 192kHz files from Astell&Kern portable hi-res players having only optical output.

   Output was 2V from the phono sockets and 3.9V from XLR. The headphone output gave a healthy 4V. 

   The Callia measured well all round. It offers a good set of results but isn’t up with the best in measured terms. NK

 

 

FREQUENCY RESPONSE (192kHz sample rate)

 

 

 

DISTORTION  (24bit  -60dB)   

 



 

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