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The
USB connector
is USB 1.1 compliant and should be used to connect directly to one of the USB
connections on your computer. This connection also powers the USB circuitry inside the
USB Dual
Pre
and will power the whole product if no other power source is available or active. To your comput-
er this connection looks like a “USB Audio CODEC” and your computer then controls the sample rate.
Since the USB connection will be carrying high quality digital audio to and from your computer as well
as bus powering the USB interface, we suggest that you use a high quality shielded USB cable for
best performance. Ideally you should connect directly to one of the USB inputs on your computer.
Connecting through a shared hub can reduce power and bandwidth that is available for each USB
device and should be avoided when possible. Though the
USB Dual Pre
is compatible with USB 1.1
and 2.0 interfaces, USB 2.0 is preferred for the cabling and computer connection as it allows for more
system bandwidth. If you must use a hub, it should be a powered USB 2.0 compliant hub for best
results, This is especially important if you plan on using multiple units for more channels of simulta-
neous digital audio input.
Both analog output jacks and the USB Out can be used at the same time, which is handy when you
want to run to a mixer and instrument amp in a live situation, or when connecting to a computer or
recording system and locally monitoring your source with headphones.
For a typical recording application where you want to add tracks of audio using the USB bus to your
computer, while monitoring the mix externally for low latency, we suggest the following: Connect your
instrument and/or microphone to the
USB Dual Pre
inputs, then connect to your computer with a
USB cable. Use the 1/4-inch monitor output jacks to feed your powered monitors or analog monitor
system and/or use the 1/8-inch jack for local headphone monitoring. Then use the Monitor Mix control
to locally adjust between the new tracks and the computer playback signal. The new track that you
are recording will be in real time and have no latency in your monitoring system.
