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COS D1

o COS D1 είναι ένας full balance προενισχυτής με DAC με ξεχωριστή εμφάνιση, σχεδιασμένος να κάνει την ψηφιακή αναπαραγωγή μουσικής να ακούγεται αληθοφανής και απολαυστική ακόμα και για τα απαιτητικότερα αυτιά. Είναι κατασκευασμένος από αεροπορικό αλουμίνιο με δυνατότητα up-sample στα 176.4K ή στα 192K. Ο D1 διαθέτει διπλό τροφοδοτικό ξεχωριστό για το αναλογικό και το ψηφιακό κομμάτι εξασφαλίζοντας πολύ ήσυχη λειτουργία..

D1, a fusion of a DAC and a pre-amp with style, is conceived and designed not only to make music based on digital data real and pleasurable, but also to meet the demand of those with willing and perfectionist ears. It renders crystal clear, spacious and dynamic music.

• STYLISH DESIGN
  The exterior of D1, composed of aerospace grade aluminum alloy which seals off electric and magnetic interference from outside, is crafted finely to embody a structure of straight lines and a single circle.
• ALGORITHM AND DSP
  COS’s proprietary algorithm with a linear-phase delay FIR filter can up-sample original data to 176.4K or 192K, and this massive computation is handled by a powerful 3648 MMAC/sec DSP.
• BUFFER and RE-CLOCKING
  D1 stores digital data in a one-second buffer before converting to analog signals, under the coordination of a crystal oscillator with a jitter precision less than 1ps and a dedicated re-clocking circuitry.
• DUAL POWER SUPPLY
  Two torroid transformers power the digital circuit and the analog circuit separately, thereby eliminating possible interferences.
• PARALLEL STRUCTURE WITH TUNING AND MATCHING
  The analog circuit bifurcates into two boards to eliminate cross-talk, and the high-performance DAC chips, one on each board running as mono, are manually tuned and matched to attain a lower distortion.
• FULLY BALANCED DESIGN
  D1’s balanced design ensures that even harmonics match and are gracefully cancelled out. Distortions are low to the extent possible.
• VOLUME CONTROL
  D1’s volume control is composed of a ladder of high precision resistors and an array of analog switches which are low in resistance, noise, and distortion.

1. SPECIFICATIONS
   Analog Input Balanced x 1, Unbalanced x 1
   Analog Output Balanced x 1, Unbalanced x 1
   Residual Noise < 2uV (-114dBV)
   (20Hz~20KHz non-weighted, input terminated)
   Input Overload 16V (balanced), 8V (unbalanced)
   (THD < 1%)
   Input Impedance 100Kohm
   Output Impedance 200 (balanced), 100 (unbalanced)
   Maximum Output 16V (balanced), 8V (unbalanced)
   (THD < 1%)
   Voltage Gain 0dB
   Frequent Response + 0.1dB
   (20Hz ~ 20KHz)
   THD+N < 0.001% (-100dB)
   (20Hz ~ 20KHz non-weighted)
   Signal To Noise Ratio > 110dB
   (20Hz ~ 20KHz non-weighted)
   Crosstalk < -120dB
   Volume 256 steps by 0.25dB/step, total range: 64dB;
   < + 0.1dB accuracy
2. Digital Inputs USB x1, Asynchronous 1.0/2.0;
   SPDIF x 1; TosLink x 1
   Sampling Rate up to 192Ksps, 24-bit
   Frequency Reponse + 0dB, – 0.5dB
   (20Hz ~ 20KHz)
   Full Scale Output 2V (unbalanced), 4V (balanced)
   THD+N < 0.001% (- 100dB)
   (192Ksps, 24-bit, 20Hz ~ 20KHz, A-weighted)
   Signal To Noise Ratio > 110dB
   (192Ksps, 24-bit, 20Hz ~ 20KHz, A-weighted)
   Digital-to-Analog
   Converter
   24-bit DAC x 2
   (up to 192Ksps, 24-bit)
   Digital Filter COS Proprietary
   Linear Phase Delay
   Weight 8.6kg
   Dimension 415mm (W) x 280mm (D) x 100mm (H)
   Power 100 ~ 120VAC or 200 ~ 240VAC selectable
   Normal Operation < 50W; Standby < 5W

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   Awards & Reviews

   6moons.com’s Blue Moon Award.

   Audio Art’s Best Value Award 2016. (in Chinese)

   6moons.com: “An advanced, very stylish DAC/Preamp.”

   Audio Art: “…lively sound, scintilating and sweet….” (content in Chinese)

   HiFi Knight: “This device offers fluency and coherence on a level very rarely heard. Extremely black background and instruments separation are both cherries on top….”

   Inearspace Good Buy Award, “Beauty In and Out.”

   HiFi+: “…full of expression and nuance….”

   HiFi Pig: “It is rare for a first product to be so good. For £8000 (€9000) it might not be cheap, but it is that good.”

   Doug Schroeder: “Unforgetable sound.”

COS D1