C O S D 2

The D2 is designed to turn digital data into real music. Armed with our proprietary algorithm, it offers a pitch-black background and expansive sound-stage, coupled with colorful, dynamic rendering of instruments and a palpable sense of vocal realism. An OLED screen displays input source, buffer and volume levels. The D2V, equipped with a volume control, offers the added capacity for sending analog signals directly to a power amplifier.


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.


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.


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.


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.


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


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.