M-Audio Fast Track C400 User's Guide download pdf (Page 8)

Fast Track C400 User Guide4

Pad Button

Each analog input channel offers a Pad button.

If your input signal is too high or “hot” even

with the Gain knob at a low setting, press that

channel’s Pad button to reduce the input signal

by approximately 20dB.

Gain Controls

These knobs adjust the input gain levels of their

corresponding Input channels. Turn a knob

clockwise to increase the gain, and counter-

clockwise to decrease it.

Signal/Clip LED Meters

The 8-segment LED meters illuminate to help

you set correct gain levels when recording in-

struments or vocals. These meters receive signals

from the Fast Track C400's analog-to-digital

converter and are very precise. If the red LED (at

the top) illuminates, it means that your signal

has overloaded (or “clipped”) the converter and

that your recording may contain audible distor-

tion. If the red LED does illuminate, decrease the

input level using the channel's Gain Knob to

prevent any additional clipping.

48V Switch and LED

Phantom power is activated by the switch la-

beled 48V on the top panel of Fast Track C400.

The LED, when lit, indicates that 48V phantom

power is active on both XLR Mic inputs.

About Phantom Power

Dynamic microphones (such as a Shure SM57)

do not require phantom power to operate, but

are not harmed by it. Most condenser micro-

phones (such as M-Audio Solaris™) do require

phantom power to operate.

If you are not sure about the phantom power re-

quirements for your microphone, consult your

microphone’s documentation or contact the

manufacturer.

Power LED

The blue Power LED indicates that Fast Track

C400 is receiving power from the USB connec-

tion.

Output Selector Buttons

These buttons switch the pairs of back panel

Outputs (A and B) on and off independently.

This is a useful feature if, for example, you wish

to check a mix between multiple sets of speakers

to ensure good “translation” of that mix on

large and small speakers.

The green LED to the right of each button illu-

minates whenever the corresponding pair of

outputs is active.

Although phantom power can be used

safely with most microphones, it is possible

to damage some ribbon microphones with

it. Always turn off phantom power and wait

at least ten seconds before connecting or dis-

connecting a ribbon microphone.

When using phantom power, Fast Track

C400 can provide up to 4 mA of current per

channel (or up to 8 mA if only one channel

is used). This is more than enough to power

most modern microphones, as well as many

vintage microphones.

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