Microsoft Windows (XP, Visa, 7 and 8) so far only supports USB Audio Class 1.0 by default, limiting the playback to 24bit/96kHz
files. Installing the driver provided with optional USB_IN board enables MS Windows computer to support USB Audio Class 2.0,
thus allowing 24bit/192kHz files playback.
DSD files need USB Audio Class 2.0 to be active and they are packed into a 24bit/176.4kHz PCM-like signal for bitstreaming. The
C1 supports the DSD over PCM (DoP1.0) format, automatically unpacks it and converts the DSD bitstream without any loss.
3.3.4.1 Microsoft Windows configuration (XP, Vista, 7 and 8)
The C1 USB Audio input should not be the MS Windows default audio output device. In addition, Windows should be configured to
allow applications to get exclusive access to the C1 USB Audio input. Below is a list of recommended media players, drivers and
related configurations to be used with the C1 USB audio input.
USB Audio Class
MS Windows OS
Output support
Required component
Driver
Configuration
Foobar (ASIO)
http://www.foobar2000.org
V1.1, freeware
1.0 XP, Vista, 7, 8 ASIO foo_asio asio4all
Buffer 8s
2.0 XP, Vista, 7, 8 ASIO foo_asio CH USB driver xVyz.zip Output 24bits
J. River Media Center (WASAPI)
http:// www.jriver.com
V15, commercial
1.0 Vista, 7, 8 WASAPI
EVENT STYLE
- - H/w buffer = 50ms
Output 24bits
2.0 Vista, 7, 8 WASAPI
EVENT STYLE
- - H/w buffer = 50ms
Output 24bits
J. River Media Center (ASIO)
http:// www.jriver.com
V15, commercial
1.0 XP, Vista, 7, 8 ASIO - asio4all Default
2.0 XP, Vista, 7, 8 ASIO - CH USB driver xVyz.zip Default
AlbumPlayer (ASIO)
http:// www.albumplayer.com
V5.2, commercial
1.0 XP, Vista, 7, 8 ASIO - asio4all Buffer = 2048 samples
2.0 XP, Vista, 7, 8 ASIO - CH USB driver xVyz.zip Buffer = 2048 samples
Recommended media players, drivers and related configurations
3.3.5 ANALOG_IN boards
ANALOG_IN boards provide analog audio input capabilities. Even though the C1 is primarily a high grade digital to analog
converter, adding one or two ANALOG_IN boards turns it into a complete preamplifier with both analog and digital inputs. Each
ANALOG_IN board adds one RCA single-ended analog input pair and one XLR balanced analog input pair.
In order to achieve optimum performance from an analog source, the ANAOLG_IN board converts the incoming analog audio
signal into a high resolution digital audio stream (5.6448MHz DSD2x) synchronously to its digital to analog output conversion
stage. The volume control is also achieved by an optimized combination of analog attenuators and high precision 32 bits floating
point multiplication in the digital domain. Following drawing shows the layout of an ANALOG_IN board connector:
Rev 1.9 C1 User Manual 23
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