MUTEC MC-1.2 - Manual (Page 16)

16
Operation
Operation of the MC-1.2
USB Operation
After connecting the USB cable coming from your computer, laptop or music server to the MC-1.2‘s USB port, an audio stream
sent from the source will be received and converted straightforward to all digital audio outputs. No further adjustments are
necessary for that general operation of your MC-1.2. That even works if the device is not connected to the mains supply, called:
USB bus-powered operation. During that, the »USB LINK« LED lights in the »STATUS
SYSTEM « menu and indicates the reception
of a valid USB audio stream, as well as the »USB POWER« LED lights. When changing to mains supply, the »USB POWER« LED
dies down and the »MAIN POWER« LED starts ligthing.
In the »CLOCK IN« menu, the LED row marked with »U« (U = USB) shows the audio clock rate embedded in the incoming USB
audio stream.
Attention
When connecting your MC-1.2 to a Windows computer, you have to use our special USB2.0 Audio Class Driver for Windows
available for download on our website. Refer to the USB Driver Installation section on page 13 for further details.
Changes form USB bus-powered to mains-powered operation may cause interruptions in the output signals!
When switching on the power switch at the rear, the MC-1.2 changes automatically to mains supply and interrupts the USB
bus supply.
Selecting a digital Audio Input
Press the »MENU« or »SELECT« key repeatedly to select your prefered digital audio input within the »AUDIO
IN « menu. The
last position of this menu enables to receive either an AES3id or a S/P-DIF signal at the (same) BNC input connector marked
at the rear with »AES3id + S/P-DIF IN«. The digital audio signal received at the selected input will be converted into an USB
audio stream and send throught the USB port into your computer, laptop or music server. During that, the »LOCK« LED lights
in the »STATUS
SYSTEM « menu and indicates the reception of a valid digital audio signal. According to the status bit coding of
the digital audio signal received, the appropriate LED in the »STATUS AUDIO INPUT « menu lights. Additionally, in the »CLOCK IN«
menu, the LED row marked with »A« (A = Audio) shows the sampling rate embedded in the incoming digital audio signal.
Attention
When receiving an USB audio stream and a digital audio signal simultaneously for bi-directional conversion, make sure that
both signal streams are of equal sampling rates.
When receiving a digital audio signal at one of the appropriate inputs, it will be converted into an USB audio stream only. A
format conversion to the digital audio outputs is not carried out.
All user-specific function settings are available furthermore when power is restored.
Status Information
The »STATUS SYSTEM «, the »STATUS AUDIO INPUT « and the »CLOCK IN « menus are for control of the MC-1.2‘s operation status
only. They are not accessable for adjustments with help of the keys.
STATUS SYSTEM
»LOCK«
This LED indicates system lock to a valid incoming digital audio signal at the selected audio input.
»USB LINK«
This LED indicates system lock to a valid USB stream at the USB port.
»MAIN POWER«
This LED indicates mains supply operation of the MC-1.2 after the power switch at the rear is switched on.