User manual WEISS DAC1-MKII

[. . . ] Both have in common the purest possible approach in audio design, aspiring for nothing less than excellence. This is coupled with an ergonomic design that gives the user immediate access to all necessary functions, while keeping an uncluttered and thus easy-to-use front panel. This combination makes a truly professional D/A converter catering for the highest expectations. The correlation technique (using two converters per channel) which was already successfully employed in the ADC1 A/D Converter gives the DAC1-MK2 an edge over other D/A converters with equal wordlength and sampling rate specifications, resulting in improved SNR and THD. [. . . ] If a valid AES/EBU or S/PDIF formatted signal is present at the selected input, its sampling rate, wordlength and emphasis status are indicated via the status LEDs. Blank sampling rate LEDs indicate that the format or sampling rate at the input are not valid. For 176. 4 or 192kHz signals the two channels are connected as follows: Left channel to input 1, Right channel to input 2. If such a signal is present at the input of the DAC1-MK2, the software automatically detects that and switches the D/A accordingly. If you press the input 2 key with such a two wire signal present at inputs 1 and 2, the DAC1-MK2 interprets the signal at input 2 as a normal two channel AES/EBU signal. The purpose is to loop in the DAC1 at various points in the signal chain for monitoring. For the third output (DO3) the source can be selected to be either Input 3 (DI3) or the currently selected input. Because the jitter reduction circuitry in the DAC1 is of the highest possible quality, sepaarate external or internal synchronization is not necessary. For applications in surround setups with more than one DAC1 unit operating in parallel, we will offer a software version which assures a determined, constant delay from input to output. the setup is retained when powering the unit off. Output Level and Output Connection The output level is set via the "high / low" switch on the backpanel and via the trim potentiometers on the frontpanel. For output levels between +15dBu and +27 dBu balanced (or +9dBu and +21dBu unbalanced) set the switch to "high". These output level figures are reached for 0dBFS at the input of the DAC1. After that, adjust the trim potentiometers to match the output level required. Note that the output amplifiers of the DAC1 are powerful class A type discrete circuits. This means that the power dissipation is quite high, so it is absolutely normal for the DAC1 unit to heat up. Important: For unbalanced operation of the DAC1 connect pin 1 (ground) and pin 2 (hot) of the output connectors to your amplifier. 42, CH-8610 Uster Page 4 of 8 ) +41 1 940 20 06 2 +41 1 940 22 14 8 http://www. weiss. ch / http://www. weiss-highend. com OPERATING INSTRUCTIONS FOR GAMBIT DAC1-MK2 24Bit / 192kHz D/A CONVERTER OPERATION Remote Control Connector A self-made remote control can be hooked up to the remote control connector. Following is the description of how such a circuitry should look like. The remote level control changes the level in the digital domain, i. e. Because of the 24 bit digital resolution of the DAC1, controlling the level in the digital domain is not critical for the sonic quality or the signal to noise ratio. [. . . ] 42, CH-8610 Uster Page 6 of 8 ) +41 1 940 20 06 2 +41 1 940 22 14 8 http://www. weiss. ch / http://www. weiss-highend. com OPERATING INSTRUCTIONS FOR GAMBIT DAC1-MK2 24Bit / 192kHz D/A CONVERTER TECHNICAL DATA Remote Connector 15 pin DSUB connector pinout: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ground ground key # 2 (switch to ground, selects input # 2) key # 4 (switch to ground, selects input # 4) LED # 1 (anode of LED for key # 1, cathode at ground) LED # 3 (anode of LED for key # 3, cathode at ground) ground +5V supply for external fader (connect fader between +5V and ground) n. c. key # 1 (switch to ground, selects input # 1) key # 3 (switch to ground, selects input # 3) LED # 2 (anode of LED for key # 2, cathode at ground) LED # 4 (anode of LED for key # 4, cathode at ground) fader channel 1 taper fader channel 2 taper Power Mains Voltage: Fuse rating: Power Consumption: 110 / 220 Volts with voltage selector 500 mA slow blow 80VA max. Daniel Weiss Engineering Ltd. , Florastr. 42, CH-8610 Uster Page 7 of 8 ) +41 1 940 20 06 2 +41 1 940 22 14 8 http://www. weiss. ch / http://www. weiss-highend. com OPERATING INSTRUCTIONS FOR GAMBIT DAC1-MK2 24Bit / 192kHz D/A CONVERTER TECHNICAL DATA Measurements Measurements taken at the following conditions (unless otherwise noticed): +27dBu output level, 44. 1kHz sampling frequency (fs), 22kHz measurement bandwidth Frequency Response: @ fs = 44. 1kHz: DC . . . > 40kHz +- 0. 5dB 115dB unweighted, 118dB A-weighted -107 dBr @ -3 dBFs input (0dBr = +27dBu) -105 dBr @ 0 dBFs input (0dBr = +27dBu) SNR @ -40dBFS input: 114dBr unweighted (0dBr = +27dBu) 117dBr A - weighted (0dBr = +27dBu) Linearity: from 0 to -100dBFs input level: < +-1dB deviation from ideal from -100 to -130dBFs input level: < +-1. 5dB deviation from ideal Crosstalk: Output Level Range: < -130dB, 0. . 20kHz range switch "high", balanced: +27dBu . . . [. . . ]