Summary of Contents for COS Engineering D1
- Page 1 WELCOME Thank you for choosing COS D1. We at COS Engineering are thrilled to share with you the joy of soaking in music through this unit. Please have a few minutes for this manual before powering D1 on.
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Page 2: Table Of Contents
CONTENTS Getting Started ..................Unpacking ..................Placement Connection ................Mains Connection .............. Earth Ground Connection ..................Input to D1 ................... Output of D1 ................Buffer Selection ..............USB Audio Selection Operation ................... Powering On ..............Selecting Input Source ................Adjusting Volume .................. -
Page 3: Getting Started
D1 needs a solid and stable surface to stand firmly and four spikes should help keep it level. D1 does not need much air to stay operational, but suffocating it is certainly a bad idea. Where D1 is placed is not critical, but please keeps it away from known magnetic fi... -
Page 4: Connection
Connection Mains Connection Before powering on, please make sure that the voltage selected, in the Voltage Selection of the back panel, is the same as the AC outlet voltage of your area. If it is not, please do the following: 1. -
Page 5: Earth Ground Connection
Connection EARTH GROUND CONNECTION In some countries, there is no earth ground established when plugging into AC mains. We recommend that this earth ground connection be connected to a known earth ground (like water pipes that run through the ground, or copper spikes that are driven into the ground for this reason). -
Page 6: Input To D1
Connection INPUT TO D1 D1 has seven input connectors on the back panel, engraved as 1 through 7. The first five are used for digital signals from computer, CD transport, DVD player, etc..., and the last two are used for analog signals from tuner, TV, setup box, and phono amp. -
Page 7: Output Of D1
Connection OUTPUT OF D1 D1 provides both balanced and unbalanced outputs, with an XLR male connector pair and an RCA connector pair, respectively. The pin assignments of XLR-type female input connectors are: Pin 1: Signal ground Pin 2: Signal + (non-inverting) Pin 3: Signal –... -
Page 8: Buffer Selection
Connection BUFFER SELECTION There is a buffer switch on the back panel of D1, 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 micros-second timing error is enough to perturb the ears and frustrate the mind. -
Page 9: Usb Audio Selection
Connection USB AUDIO SELECTION D1 supports both USB Audio Class 1.0 and 2.0. The selection is made through adjusting USB switch on the back panel. 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. -
Page 10: Operation
Operation Precaution! Before power on D1 for the first time, please double check if the AC voltage selector is set to the correct voltage. Please refer to “Power Supply” section for detail instructions on how to adjust the voltage selector. -
Page 11: Powering On
After that, seven LEDs remain on and the leftmost will blinks with extra brightness. Now the D1 is successfully powered on and ready for input source selection. -
Page 12: Adjusting Volume
More LEDs light up when the volume goes up, and less when the volume goes down. MUTING D1 The sound of the music can be turned off by pressing the MUTE key on the remote control. Hit any key (except the STANDBY key) on the remote control or rotate/press the knob on the front panel can bring the sound back again. -
Page 13: Standby Mode
D1 into standby mode. In this mode, the volume and output relays will be turned off, and D1 will go into low power consumption state. Moreover, all the LEDs are off except the center one (6 o’clock position). -
Page 14: Optimizing Performance
Operation Tips for Optimum Performance • Ten minutes war m up time will help D1 to reach its ultimate performance once internal thermal equilibrium is attained. • Switch buffer on for music playing and switch it off for video playing. -
Page 15: Specifi Cation
Specifi cation SPECIFICATIONS Pre-Amplifi er Analog Input Balanced x 1, Unbalanced x 1 Analog Output Balanced x 1, Unbalanced x 1 < 2uV (-114dBV) Residual Noise (20Hz~20KHz non-weighted, input terminated) 16V (balanced), 8V (unbalanced) Input Overload (THD < 1%) Input Impedance 100Kohm Output Impedance 200 (balanced), 100 (unbalanced) -
Page 16: Specifi Cation
Specifi cation SPECIFICATIONS USB x1, Asynchronous 1.0/2.0; Digital Inputs SPDIF x 1; TosLink x 1 Sampling Rate up to 192Ksps, 24-bit + 0dB, - 0.5dB Frequency Reponse (20Hz ~ 20KHz) Full Scale Output 2V (unbalanced), 4V (balanced) < 0.001% (- 100dB) THD+N (192Ksps, 24-bit, 20Hz ~ 20KHz, A-weighted) >...
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