Data Conversion Systems DCS VIVALDI DAC User Manual
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dCS Vivaldi DAC User Manual Software Issue 1.0xAugust 2012Filename: Vivaldi DAC Manual v1_0x.docx Page 19 English versionPower ButtonTo switch on, ensure the rear panel switch is set to I and press the Power button (C) on the frontpanel once. Note that the unit cannot be turned on from the remote control.To set the unit to sleep mode, press the Power button once. The main display will turn off, the LED(D) beside the button will light, and the analogue outputs will mute, but the unit will remain close torunning temperature. Press again to return to normal operation.To switch off, hold down the Power button for about 3 seconds until Switching Off appears on thedisplay, then release it.When the menu is open, press the Power button to close the menu.Menu ButtonPress the Menu button (E) to open the menu, select menu pages and change settings. See the Menusection on page 25 for information on using the menu features.Filter ButtonUse the Filter button (F) to select your preferred filter. This is a personal preference and is best doneby ear. The choice of filter may depend on the type of music you are listening to.In PCM mode, the first 4 filters give different trade-offs between the Nyquist image rejection and thephase response. Filter 1 has the best rejection of (unwanted) Nyquist images and the sharpest roll-off,resulting in the poorest transient response of the four. Filters 2, 3 and 4 have progressively morerelaxed image rejection and progressively better transient response. Filter 2 is often preferred fororchestral music, while Filter 3 and Filter 4 are often used for rock music.If the source data rate is 176.4, 192, 352.8 or 384kS/s, two extra filters are available. Filter 5 has aGaussian response and Filter 6 is an asymmetrical type which features almost no pre-ringing.There are 2 extra filters for 44.1kS/s operation. Filter 5 is an asymmetrical design with non-linearphase and no pre-ringing. Filter 6 is a new sharp filter which has linear phase and pre-ringing. Trythem and decide for yourself which you prefer. The impulse responses for the six 44.1kS/s filters areshown below. The horizontal or time axis is graduated at 100 microseconds per division.Filter 1 Filter 2 Filter 3 Filter 4 Filter 5 Filter 6DSD mode has 4 filters, but these progressively reduce the out-of-band noise level (which is inherentin the 1-bit nature of DSD). Filter 1 is the usual setting – it gives the widest bandwidth (about 70kHz)and the highest level of out-of-band noise. If your system sounds harsh, try Filter 2 or Filter 3. Theseprogressively reduce the out-of-band noise level at the cost of some bandwidth. Filter 4 is primarilyintended for troubleshooting, not listening, as it cuts off sharply at 20kHz to minimise the out-of-bandnoise.“I don’t have time to listen to all these filters! Which ones do you suggest?”Filters are definitely a personal choice, but we can recommend the following:44.1kS/s – Filter 5 (asymmetrical) 32, 48, 88.2, 96kS/s – Filter 2176.4 - 384kS/s – Filter 6 (asymmetrical) DSD – Filter 1 |
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