COS ENGINEERING

C O S D 1


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.

$15,000 inc GST


More reading >>>> brochure

COS ALGORITHM AND DSP D2


COS Engineering’s proprietary algorithm up-samples original data to 176.4K or 192K, 24-bit by a process in an array of 4096 with 32-bit precision. To rule out phase contamination that may stem from the more computationally efficient IIR filter, a linear-phase delay FIR filter is chosen. This massive computation is handled by a powerful DSP capable of 3648 MMAC (millions multiply and add) per second.


BUFFER AND RE-CLOCKING

D2 receives data from digital sources, whether a PC, a CD transport, or a mobile device, aligns them in exact frames with a one-second buffer, and sends them out for interpretation by the COS algorithm. The data so processed is then converted to analog signals, under the coordination of a crystal oscillator with a jitter precision less than 1ps and a dedicated re-clocking circuitry.


POWER

D2 harnesses two selected switching mode power supplies with specially designed circuitry for lower noise. These power supplies work with 100~240VAC; there is no need to select voltage.


FULL BALANCED DESIGN

Balanced designs are applied throughout the entire audio signal path. Even-order harmonics on the differential signal pairs are carefully matched and are thus gracefully cancelled in order to achieve the lowest possible distortions.


GALVANIC ISOLATION

The galvanic isolation between digital and analog circuitries further ensures that the audio signal is not to be contaminated.


VOLUME CONTROL (D2V ONLY)

D2’s volume control is composed of a ladder of +-0.1% high precision resistors and an array of analog switches which are low in resistance, noise, and distortion. No mechanical parts are used. Frequent use does not erode its precision.

$5,300 inc GST , Pre add $1,200.


More reading >>>> brochure

C O S H 1


H1 is an audiophile-grade DAC plus fully balanced headphone amplifier, featuring COS Engineer’s proprietary digital-to-analogue algorithm. For those who seek acoustic joy through headphones, H1 is a ‘must have’ because of the details and the smooth yet dynamically powerful sound it provides.


COS ALGORITHM AND DSP

COS’s proprietary algorithm with a linear-phase delay FIR can up-sample original data to 176.4K or 192K, and this massive computation is handled by a powerful 3648 MMAC/second DSP.


BUFFER AND RE-CLOCKING

H1 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.


HEADPHONE

4 power amplifiers to accommodate 2 unbalanced headphones or 1 balanced headphone.


POWER

H1 harnesses a selected switching mode power supply with specially designed circuitry for lower noise, and galvanic isolation between digital and analog circuitries are added to prevent audio signals from being contaminated.


VOLUME Control

H1’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.

$5,000 inc GST


More reading >>>> brochure