Teac FireOne - Manual (Page 8)

IMPORTANT SAFETY PRECAUTIONS
TASCAM FireOne
The controls and connectors of the FireOne are described in
the following sections. Note that the specific functionality of
the control surface buttons may vary with the application that it’s being used with. Please refer to the Application Guide
for more details.
1 SIG and OL indicators
Each input has indicators located just above its associated
GAIN control to assist in setting the proper input signal
levels. The SIG indicator flashes green to indicate that
an audio signal is present at that input connector. The
OL indicator flashes red when a signal approaching the
FireOne’s clipping level is detected (the signal level that
causes
OL to flash is -2.5dBFS).
When one of these indicators lights, it indicates an over-
loaded input, and you should reduce the level of the input
to the channel gradually, until the
OL indicator stops
flashing.
WARNING
If you ignore the OL indicator, peaks in the incoming
signal will be internally clipped at the A/D converter
input, resulting in distortion in the recorded signal!
2 GAIN controls
The GAIN controls allow the signals at FireOne’s input
jacks to be amplified or attenuated, such that the signal at
the input to the A/D converter can be optimized. Careful
optimization of the signal levels will maximize the
signal-to-noise ratio of the recorded signal, while prevent-
ing distortion due to overload. The signal level indicators
described below will help you to set the proper levels. In
the section on metering, we’ll also describe a way to use
FireOne’s stereo meters to help you set the input level
most accurately.
3 PHANTOM switches and indicators
The XLR connectors on the FireOne inputs can be used
to supply phantom power to microphones which require
its use. Each input has an associated
PHANTOM pushbut-
ton switch, and an LED indicator to indicates the status of
+48 V phantom power on the channel.
WARNING
Microphones should not be connected to or discon-
nected from the FireOne with phantom power
switched on. Unbalanced ribbon microphones should
never be connected to phantom-powered connectors.
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2 - Features of the FireOne