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9
The amplifiers in the Impulse 1015P are equipped with DDT
™
and an LED indicator to show it has engaged. If the
sound seems heavily compressed and the DDT indicator is lighting more than occasionally, then the drive level
from the mixer (or the Volume control on the Impulse 1015P) needs to be reduced.
When first turning on the sound system, switch-on all upstream electronics first, then the Impulse 1015P with its
volume control 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 1015P volume control set to the desired
setting (halfway up recommended to start).
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With the mic input (8) switched on (7), a signal will be sent to the Impulse 1015P preamp electronics. Be sure to
keep the mic away from the front of the speaker after switching the mic input ON and during level setting of the
microphone, as very loud feedback will occur! The recommended placement of the person using the microphone
is to the side and slightly to the rear of the Impulse 1015P, not out in front of the speaker system. When not
using the mic input, be sure to switch off the mic (7) for the lowest noise and hum pickup.
Set the microphone level using the Volume control (6), the sound source may be louder during the actual
presentation, and there is also the possibility that the microphone may be brought closer to the front of the
speaker later on. For best results, the microphone should be held close to the user mouth instead of a foot or
more away. Do not “eat” the mic that is, do not put your lips right on the mic, as this can often result in a boomy
sound. The best results are obtained when the mic is approximately 2-3" away from the mouth.
When using the mic input (8) and the regular inputs (5) for simultaneous music, speech or singing, the volume
for the mic should be set first using the Level control (6) as described above. The level fed to the regular inputs
should be set to the desired level and matched to the microphone levels using the source Level Control or mixer.
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(or other Impulse series powered products)
Multiple parallel inputs allow the Impulse 1015P to be “daisy-chained” from one to anther. Run the first cable
from the mixer to the first Impulse 1015P, then hook a cable from its inputs to the second Impulse 1015P’s input.
This can be continued for several units, depending on the length and total capacitance of the cables. With a low
source impedance, such as a typical mixer output and typical balanced cables, two or three Impulse 1015Ps can
be daisy-chained from one output using 30' or 40' cables without obvious loss of high frequencies.
The Loop-Thru jacks (10) can also be used to connect an Impulse 1015P or another Impulse series powered unit,
and conveniently control volume from just one of the units. Connect a well-shielded 1/4" to 1/4" phone plug
patch cord from the Loop Out jack of the unit with its input connected to the signal source, and then plug this
cable into the other unit’s Loop In jack. The Volume control of the first unit now controls the volume for both
identically.
Do not connect cables to the jacks while the units are ON and the Volume is turned up!