Peavey Impulse 12 D Operating Manual page 19

INPUT 2 (B)
Input 2 is switchable between line-level gain and mic-level gain. The line-level input is medium impedance
balanced. The input 2 jack (8) is a combo female XLR and 1/4" TRS connector. Input 2 also has a pair of RCA
phono jacks (10) wired in parallel with the above listed inputs. These are mixed in parallel with each other and
are Mono inputs (not stereo inputs). The signal to input 2 is mixed with the signal from input 1 and fed to the
internal crossover and signal processing.
MIC/LINE SWITCH, PRESENT ON BOTH INPUT 1 AND INPUT 2 (5,6)
Switches the sensitivity of the input from line-level to mic-level sensitivity. Pushed in, the sensitivity is set for
line-level input signals. When the switch is not pushed in, the sensitivity is increased by 30 dB so it is suitable
for mic-level signals. Note that this switch changes the input's sensitivity, but does NOT provide phantom power,
thus the microphone used must be a dynamic type microphone.
MIC/LINE SWITCH LED, PRESENT ON BOTH INPUT 1 AND INPUT 2 (11,12)
Illuminates green when Mic/Line switch (5 and/or 6) is in line-level mode, and yellow when the Mic/Line switch
is in mic-level mode.
GAIN, PRESENT ON BOTH INPUT 1 AND INPUT 2 (13, 14)
Controls the gain (level) of the input channel with which it is associated. It is used to directly set the system
output level for a given input signal.
SIGNAL / CLIPPING LED, PRESENT ON BOTH INPUT 1 AND INPUT 2 (15,16)
These are located to the right and down from the GAIN knob for each input channel. It is off, or dark, when no
signal is applied to that input. It flickers green in time with the music when a signal is applied, getting brighter
with increased signal output. It turns red when either of the power amps clip or when the input channel is
overloaded.
FRONT LOGO LED SWITCH (17)
This 3-position slide switch (17) provides a means to alter the signal information indicated by the front logo LED.
The front LED indicator is incorporated into the logo on the woofer grille and normally glows blue for two of the
three Front LED Switch positions.
With the switch in the "off " position (to the far right), the front LED is turned off. This setting can be useful when
the light of the LED causes an artistic disruption.
With the switch in the "signal" position (in the middle), the front logo LED is blue when power is applied to the
powered speaker electronics, and flashes red when the amplifiers are clipping. In this position, if the amplifier
goes into protection mode, the front logo LED will stay red until the amplifier comes out of protection. The front
logo LED is the only indicator that provides an indication of amplifier protection mode on the Impulse ® 12D.
This switch position is recommended for use in permanent installations to maximize the information available to
the system operating personnel.
With the switch in the "power" position (to the far left), the front LED is blue when power is applied to the
powered speaker electronics, but does not change color when the speaker's power amplifiers are clipping.
DyNAQ SECTION (C)
™
The DynaQ section provides for a variety of tone shaping options or the selection of a nominally flat response.
The Music/Speech switch (18) provides a dynamic treble boost that is signal level dependant (Fletcher-Munson
type compensation) when in the "Music" or "out" switch position. When in the "Speech" or "in" switch
position, the Treble boost is turned off, as is any Bass Enhancement if activated, and low-pass and high-pass
filters are engaged to help roll-off the frequency extremes to assure a clean and clear vocal presentation. The
®
"Speech" position is useful for direct interface of a dynamic microphone to the inputs of the Impulse 12D.
When the Music/Speech switch is pushed in, and the Speech mode is engaged, the LED (19) to the upper right
glows Green.
19