CONNECTING A SIGNAL TO THE IMPULSE® 12D
There are a variety of ways to input a signal to the Impulse® 12D. The two inputs (7,8) provide either a balanced mic- or
Unbalanced inputs are also provided, as the ¼” input (7,8) can take a standard
Do not connect cables to the jacks while the unit is ON with the Gain knob(s) turned up! While a standard
Sometimes, with difficult interference problems, it will be helpful to lift the shield ground on a balanced cable at the Impulse® 12D end by only using the ground lift switch (4). Check any input changes carefully, always turning the gain control down before plugging and unplugging cables or engaging the ground lift switch.
Use of high quality, premium cables is recommended for the Impulse® 12D, as these usually have better shielding and materials and will provide greater
GAIN CONTROL ADJUSTMENT
The Impulse® 12D is equipped with a Gain control (13,14) on each of the two input channels to facilitate use in many different applications. With the Gain control adjusted fully clockwise, gain is at maximum and the input sensitivity is 0.200 V RMS for
If the mixing board indicates clipping of its output signals, then all of the Impulse® 12D power capability is not being utilized cleanly. Clipping the signal before it gets to the Impulse® 12D is not optimal. Reduce the mixer output level and turn up the Gain control(s) on the Impulse® 12D.
The amplifiers in the Impulse® 12D are equipped with DDT™ and multiple LED indicators to show that DDT™ has engaged (15,16, front grille logo).
If the sound seems heavily compressed, check these indicators; if it is blinking RED more than occasionally, then the drive level from the mixer (or the Gain control/s {13,14} on the Impulse® 12D) needs to be reduced.
When first turning on the sound system, switch on all upstream electronics first, then the Impulse® 12D with its Gain control(s) fully counterclockwise (all the way down). Begin checking levels with the mixer output level controls all the way down, and bring them up slowly with the Impulse® 12D Gain control/s set to the desired setting
It is not good practice to turn the Gain control(s) on the Impulse® 12D all the way up and then try to control level only from the mixer, as this approach would tend to pick up excess noise. The best practice would be to run a “hot” signal from the mixer down the cable to the Impulse® 12D, and then turn the Impulse® 12D Gain control up only as much as necessary to reach full desired output. With this approach, it is necessary to verify the mixer output is not clipping.
If a particular input channel is unused, the best practice is to turn the Gain knob all the way down, or fully
MIC/LINE SWITCH ADJUSTMENT
The mic/line switch (5,6) provides for the increased gain needed for microphone use into the two inputs.
Set the Mic/Line switch to “in” for
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