Canor Precision Tube DAC 2.10 USB DAC w/Tube Output Lab Report

Lab Report

This well-implemented 6922 triode-based analogue output incurs a mere 0.0075% distortion across the full 20Hz-20kHz audio range at the max. 3.9V balanced output. Distortion falls to just 0.0005% over the top 30dB of its dynamic range [see Graph 1], the A-wtd S/N ratio remains a wide 110dB and low-level resolution is good to within ±0.1dB from 0dBFs to –100dBFs. 'Reclocking', incidentally, has very little impact on jitter which remains exceptionally low at 6-10psec but the triode output does raise its head in the increased (bass) source impedance (205ohm/1kHz to 1.65kohm/20Hz). However, it's your choice of filter (digital or analogue) that'll have greatest subjective impact.

In order, the filters are Linear Phase Fast [black traces, Graph 2], Linear Phase Slow, Minimum Phase Fast, Minimum Phase Slow [blue], Apodising Fast, Corrected Phase Fast [or Hybrid, green], Brickwall and 'Oversample Bypass' [red]. The Linear/Minimum/Apodising Fast and Brickwall all have sharp roll-offs [the Hybrid filter has a steep but early roll-off], with Linear/Minimum Slow and 'oversample bypass' offering gentler treble roll-offs, reduced 'ringing' but poorer stopband rejection. Specifically, the five 'Fast' filters offer a 75-99dB rejection of digital aliasing images with 48kHz media, falling to 12-18dB with the Slow and 'Oversample Bypass' filters – these are best suited to higher sample rate files. With 48kHz media the responses reach out to –0.0dB, –3.5dB, –0.04dB, –5.0dB, –0.8dB, –12dB and –4.0dB/20kHz, respectively (and –0.3dB/20kHz with 'Oversample Bypass'). With filter 1 (Linear Phase Fast), enabling the analogue filter limits the response to –0.4dB/20kHz, –15dB/45kHz [dashed trace, Graph 2] and –30dB/60kHz. PM


THD versus digital level over a 120dB range with 24-bit/48kHz data (1kHz, black; 20kHz, blue)


Freq. and time resp. (96kHz files) with fast linear (black; w analogue filter, dashed), slow minimum (blue), hybrid (green) and 'oversample' (red)

Maximum output level / Impedance 3.9Vrms / 205-1650ohm
A-wtd S/N ratio 109.7dB
Distortion (1kHz, 0dBFs/–30dBFs) 0.0075% / 0.0005%
Distortion & Noise (20kHz, 0dBFs/–30dBFs) 0.0076% / 0.0007%
Freq. resp. (20Hz-20kHz/45kHz/90kHz) +0.0 to –0.0dB/–0.5dB/–0.7dB
Digital jitter (48kHz / 96kHz) 6psec / 10psec
Resolution (re. –100dBFs / –110dBFs) ±0.05dB / ±0.6dB
Power consumption 32W (1W standby)
Dimensions (WHD) / Weight 435x120x405mm / 11kg
Price £4000

Canor, spol. s r.o.
Supplied by: Signature Audio Systems, UK
07738 007776