Peavey DM 115 Operating Manual page 13

ent AC outlet. Sometimes, if a different
circuit (breaker) is used for the mixer and for the DM™115, it can cause hum problems. Unless it is not practical,
it is best to use the same wall outlet (breaker) to supply power to both the mixer and the powered speaker.
Ensure that shielded cables have been used to route the signal to the DM™115's input. If speaker cables with 1/4"
plugs are used as input cables instead of shielded cables, they will be prone to hum or buzz.
Hum may be ground loop related. It may be helpful to lift the shield ground (Pin #1) on a balanced cable at the
DM™115 end. Check any input changes carefully by first turning down the Level control, before plugging and
unplugging cables, or lifting the shield ground at the speaker end.
Check to make sure light dimmers are not on the same circuit as the DM™115, the mixer or any source devices.
If light dimmers are used, then it may be necessary to turn them full ON or full OFF to eliminate or reduce hum.
This is a typical AC wiring/light dimmer interference problem, not a design flaw of the DM™115.
The third wire (ground plug) on the AC plug should NEVER be removed or broken off, as this is a potential
safety hazard.
Distorted or Fuzzy Sound
First, ensure the mixer (signal source) is not clipping or being overdriven. Make sure the Gain (6) control on the
DM™115 has not been set too low. Check that the input plug is fully seated in the input jack on the rear panel of
the DM™115. Ensure that a power amp has not been plugged into the input jack of the DM™115. If an extension
cord is being used to provide the AC power to the unit, insure that it is of sufficient current capacity and that it is
not also being used to supply power to any other device.
The DM™115 has built-in EQ to smooth and extend the natural response of the speakers. If excessive additional
bass boost or HF boost have been added externally to the DM™115, it could cause premature overload at high
SPL. Reduce the amount of any external (mixer, rack) EQ and see if that clears up the distortion.
Finally, realize that even though the DM™115 is a powerful and high output unit, it does ultimately have limits,
and it may need additional powered units (or a subwoofer) to provide enough sound output or coverage. In this
case, try turning the mixer levels down a little to see if that clears things up. If, after checking all the things listed
to check and anything else you can think of to check safely, and the system still exhibits problems, carefully note
all conditions and check with your Peavey dealer for advice.
Care and Maintenance
Your DM™115 is a sturdy and durable product and will provide years of reliable use if properly cared for. Use
common sense and read the safety warnings to avoid hazardous operating conditions.
The unit must be disconnected from the AC power source before any work is done on it. Refer all servicing to
qualified service personnel.
Sunlight/Heat
Avoid prolonged exposure to direct sunlight, as this may cause the unit to overheat and thermally shut off.
Excessively hot operating conditions can also cause a thermal shutdown.
Do not store in extremely hot or cold conditions or extremely high humidity. Always allow unit to come to room
temperature before use.
Cleaning
Never clean the DM™115 while plugged in or turned ON! When the unit has been fully disconnected from AC