Presonus-audio-electronic Microphone Preamplifier User Manual download pdf (Page 24)

CONTROLS AND CONNECTIONS

22 | PreSonus 2007

• Instrument Inputs (Channels 1 and 2).

The ¼” TS connector on channels 1 and 2 are for use with an

instrument (guitar, bass, etc.). When an instrument is plugged into the instrument input, the

microphone preamp is bypassed, and the FireStudio Project becomes an active instrument preamplifier.

NOTE: Active instruments are those that have an

internal preamp

or a

line level output

. Active

instruments should be plugged into a line input rather than into an instrument input. Plugging a line

level source into the instrument inputs on the front of the FireStudio Project not only risks damage to

these inputs but also results in a very loud and often distorted audio signal.

(In other words, don’t plug a line level source into the combo jacks of channel 1 or 2.)

• Input Gain/Trim Control.

These knobs provide the following gain structure:

XLR Microphone Inputs.

54 dB of variable gain (-4 dB to +50 dB)

TS ¼” Instrument/Hi-Z Inputs.

54 dB of variable gain (-4 dB to +50 dB)

TRS ¼” Line Inputs.

32 dB of variable gain (-16 dB to +16 dB trim adjustment)

• LED Meters / Clip Indicator.

Each channel features three LED level indicators. The green LED will

light up when your input signal from the XLR (Mic) or ¼” (line) reaches -40 dBFS. The yellow LED

will light up when the channel’s input signal reaches -6 dBFS (+4 dBu). The red clip indicator LED

will illuminate when the channel’s input signal reaches 0 dBFS. At this level, your mic preamp/line trim

signal will exhibit signs of clipping such as distortion. It is highly recommended you do not allow your

converters to clip (the red clip indicators to light up) as the sound quality will not be desirable.

Mic Instrument

FIRESTUDIO

™

+20-2 0

0 60

+20-2 0

0 60

+20-2 0

0 60

+20-2 0

0 60

+20-2 0

060

+30-1 0

0 60

+30-1 0

+20-2 0

0dB

-6dB

-40dB

0dB

-6dB

-40dB

0dB

-6dB

-40dB

3/ 4

48V

5/ 6

48V

7/ 8

48V

1/ 2

48V

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Presonus-audio-electronic Microphone Preamplifier User Manual Page 24

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