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If the Impulse 115P has been subjected to direct sunlight or excessive heat the built-in thermal protection
may have been triggered. If you suspect this may be the cause‚ turn off the Impulse 115P and let it cool for
a sufficient amount of time.
If there is still no output‚ contact your authorized Peavey dealer or the Peavey International Service Center.
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If the Impulse 115P is producing a hum or buzz‚ it could be AC-outlet related. Try plugging the unit into a
different AC outlet. Sometimes‚ if a different circuit (breaker) is used for the mixer and the Impulse 115P‚ it
can cause hum problems.
Ensure that shielded cables have been used to route the signal to the Impulse 115P’s inputs. If speaker
cables with 1/4" plugs are used as an input cable instead of a shielded cable‚ it will be prone to hum or
buzz.
Hum may be ground loop related. Two ground lift switches are provided on the Impulse 115P. One is
located at the input jack group (10a) and the other at the High-pass output jacks (10b). Check any input
changes carefully by first‚ turning down the volume control before plugging and unplugging cables or
switching ground lifts.
Check to make sure light dimmers are not on the same circuit as the Impulse 115P‚ the mixer or any source
devices. If light dimmers are used‚ then it may be necessary to turn them full On or Off to eliminate or
reduce hum. This is a typical AC wiring/light dimmer interference problem and not a design flaw of the
Impulse 115P. The third wire ground plug on the AC plug should NEVER be removed or broken off.
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The Impulse 115P produces extremely high output capacity at very low frequencies. It is capable of
vibrating objects in any room that are not solidly affixed or mounted. It can excite light fixtures‚
suspended ceilings‚ racks‚ shelves‚ tables‚ chairs‚ equipment cases‚ lift handles on equipment‚ casters‚
doors‚ windows‚ etc. Be sure to check where the sound is coming from as it is likely coming from one of
these sources and not a fault of the unit.
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Ensure the Mono button (5d) is switched to the On (In) position. This should eliminate any high frequency
output from the subwoofer.
If the unit is being used in 3-channel stereo mode‚ some high frequencies may be generated by the
subwoofer when a high-frequency signal is present only in one channel. This is normal and should not
present a problem.
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The level of the subwoofer may be turned up too high. The
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settings may be set too high. Turn
down the subwoofer level by turning down the Quake/Sub level control (7a) until the sound improves. To
reduce the amount of
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processing without changing the subwoofer level‚ turn the Master System
level control (6) down and the Quake/Sub level control (7a) up until the subwoofer is back at the previous
level. When in 3-channel operation‚ turn the Quake/Sub level control (7a) down.
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First‚ ensure the mixer (signal source) is not clipping or being overdriven. Make sure the volume control
(6) on the Impulse 115P has not been set too low. Remember‚ it takes a lot of signal to drive the unit to
full power.
Check that the input plugs are fully seated in the input jacks (5) on the rear panel of the Impulse 115P.
Ensure that the proper inputs are being used for the line level signals and that a power amp has NOT been
plugged into one of the input jacks of the Impulse 115P.
If an extension cord is being used to supply AC power to the unit‚ ensure that it is of sufficient current
capacity and that it is not also being used to supply power to any other device.