COS D2, D2V User Manual

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Thank you for choosing D2/D2V.

Please have a few minutes for this manual before powering D2/D2V on. In what follows, D2 refers to both D2 and D2V, but anything related to volume is applicable to D2V only.

WELCOME

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Getting Started

Unpacking

Placement

Connection

Mains Connection

Input

Analog Output

Buffer Selection

USB Audio Selection

Operation

Powering On And Off

Selecting Input Source

Adjusting Volume Level

Standby Mode

Remote Control

Display

Tips for Optimum Performance

Speciﬁcation

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You will ﬁnd in the D2 box the following:

• COS D2

• a remote control (D2V only)

• this manual

Please keep the D2 box. In an unlikely event that maintenance is needed, the box shall be used for protection of D2 in transit.

UNPACKING

Getting Started

PLACEMENT

D2 needs a solid and stable surface to stand ﬁrmly, and four boots should help keep it level. D2 does not need much air to stay operational, but suffocating it is certainly a bad idea. Where D2 is placed is not critical, but please keep it away from known magnetic ﬁelds.

CONTENTS

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#1 USB Audio (USB Type B connector)

D2 supports both USB Audio Class 1.0 and 2.0 with the following

sampling rates and bit depths:

• Audio Class 1.0 - up to 96K samples per second, 16/24 bits depth

• Audio Class 2.0 - up to 192K samples per second, 16/24 bits depth and DSD64/DSD128 (DoP)

#2/#3 Optical Input (Toslink) #4 S/PDIF Input (RCA connector) #5 AES/SBU Input (XRL female connector pair)

Pin 1: Ground Pin 2: Signal + (non-inverting) Pin 3: Singal - (inverting) Connector ground lug: chassis ground

There is a buffer switch on the back panel, and it should be turned on for optimum performance. Sometimes digital music data do not move along and get converted in perfect tandem, which causes jitters, and even a few micro-seconds timing error is enough to perturb the ears and frustrate the mind. Therefore, D2 uses a buffer of one-second depth, along with an independent and accurate clock, to receive data, align them and send them out in precise time frames for conversion.

For videos, the buffer should be switched off. This selection makes D2 reduce the depth of the buffer a little to ensure video-audio synchronization. Switching the buffer on or off takes effect immediately.

BUFFER SELECTION

Connection

INPUT

Connection

1. Unbalanced analog output: RCA

2. Balanced analog output: XLR male The pin assignments of these XLR-type male outputs are: Pin 1: Ground Pin 2: Signal + (non-inverting) Pin 3: Singal - (inverting) Connector ground lug: chassis ground

ANALOG OUTPUTMAINS CONNECTION

D2 works from 100 to 240VAC mains, so voltage selection is not needed.

Please set D2 into standby mode and use the USB AUDIO switch on the back panel to make your selection. The selected class takes effect when D2 leaves standby mode. Both Audio Class 1.0 and 2.0 work on MAC OS, but only Class 1.0 works on Windows. They are natively supported; there is no need for additional device drivers.**

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After power is switched on, the COS logo will appear on the display for a few seconds, and the working status such as input source will be shown afterwards. Now D2 is successfully powered on and ready for input source selection.

The default input source is USB 1.0 or 2.0 depending on your selection from the back panel, and the next input source can be selected by shortly pressing the knob. The order of the selection is USB 1.0 (or 2.0), Optical, RCA, XLR, and back to the USB 1.0 (or 2.0) as a loop.

SELECTING INPUT SOURCE

D2 supports both USB Audio Class 1.0 and 2.0. The main difference between USB Audio Class 1.0 and 2.0 is that the USB Audio Class 1.0 can’t go beyond 96K samples per second with 24 bit data depth.

Always power D2 off or put D2 into standby mode before adjusting the USB Audio Selection switch. The selection takes effect when D2 is powered on or leaves standby mode.

Operation

USB AUDIO SELECTION

Connection

Volume is changed by rotating the knob. Rotating the knob counterclockwise brings the volume up; clockwise, down. And it is shown on the display from -63.75dB to 0dB (loudest) with a 0.25dB interval.

ADJUSTING VOLUME LEVEL

POWERING ON AND OFF

A long press (about one second) on the knob or a press on the STANDBY key on the D2 remote control puts D2 into standby mode. In this mode, the volume and output relays are turned off, and D2 goes into a state of low power consumption. Another long press on the knob or a press on the STANDBY key on the remote control makes D2 leave standby mode; music resumes and volume hops back to the previous level.

STANDBY MODE

The D2 remote control is easy to use. Just aim the remote control at D2 and press buttons. When power is running low, please use a screwdriver to open the cover at the back of remote control to replace batteries.

REMOTE CONTROL

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Operation

STANDBY MODE

A 128 by 64 pixels white OLED display is used to show the current status.

DISPLAY

Volume shown on the upper portion

Buffer

Input Source

Music Status

(Solid: Play

Blinking: Mute)

Buffer

Input Source

Music Status

(Solid: Play

Blinking: Mute)

D2V

Operation

• Give D2 ten minutes to warm up and attain an internal thermal equilibrium, which ensures a seamless ﬂow of enchanting music.

• Switch the one-second buffer on for music and off for video.

• Turn off the up-sampling feature of your player and play music at its original sampling rate. D2's dedicated DSP with COS Engineering's

algorithms will do a the job.

• Fix the volume of your player at its maximum and use D2 to adjust

volume. Failing to do so may reduce the bit-depth of music data and compromise musicality.

If you are a Windows user and interested in using Audio Class 2.0 for D2, please visit

www.cosengineering.com. Driver and more information are available.

TIPS for OPTIMUM PERFORMANCE

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Speciﬁcation

SPECIFICATIONS

DAC

Steps 256 steps by 0.25dB/step

Total Range 64dB

Accuracy

Within + 0.1dB

Digital Inputs

USB x1, Asynchronous 1.0/2.0; SPDIF x 1; TosLink x 2; AES x 1

Sampling Rate

TosLink x 2; AES x1

Optical / RCA / XLR: up to 192K PCM

24 bits & DSD64 (DoP)

USB 1.0 – up to 96K PCM 24 bits

USB 2.0 - up to 384K PCM 24 bits &

DSD64/DSD128 (DoP)

Digital-to-Analog Converter

24-bit DAC x 2

(up to 192Ksps, 24-bit)

Digital Filter

COS Proprietary

Linear Phase Delay

Speciﬁcation

SPECIFICATIONS

Analog Output

Frequency Reponse + 0dB, - 0.5dB (20Hz ~ 20KHz)

THD+N

< 0.001% (- 100dB) (192Ksps, 24-bit, 20Hz ~ 20KHz, A-weighted, 16 ohm load, 2Vrms)

Signal-to-Noise Ratio

>110dB (192Ksps, 24-bit, 20Hz ~ 20KHz, A-weighted, 16 ohm load, 2Vrms)

Output Impedance 100 ohm

Full Scale Output

Unbalanced: 2Vrms

Balanced: 4Vrms

General

Disply 128 x 64 pixels white OLED

Weight 3.5 Kg

Dimension

260 mm (W) x 250 mm (D) x 60 mm (H)

(boot is not included)

Power

100 ~ 240VAC

Normal Operation < 15W

Standby 0.5W (typical)