Crest Audio LQ 10P - Manual (Page 11)

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If there is still no output, make sure the volume control has been turned up
to a reasonable level (one-third to halfway).
Has the LQ 10P been in direct sunlight or excessive heat? If so, it may have
triggered the thermal protection.Turn off the unit and cool as best as the
situation allows. (DO NOT use liquids for this purpose!)
If there is still no output, it may help to read the owner’s manual completely.
H Hu um m o orr B Bu uz zz z
This can be AC outlet-related.Try plugging the LQ 10P into a different AC
outlet. Sometimes using a different circuit (breaker) for the mixer and the
LQ 10P can cause hum problems.
Check to make sure that shielded cables have been used to get the signal to
the LQ 10P’s inputs. Speaker cables with 1/4" or XLR plugs are very prone
to hum.
Check to make sure light dimmers are not on the same circuit as the
LQ 10P or the mixer (or any source devices). If light dimmers are in use,
then it may be necessary to turn them fully on or fully off to eliminate or
reduce hum to tolerable levels.This is an AC wiring/light dimmer
interference problem, and not the fault of the LQ 10P.
The third wire ground plug on the AC plug should NEVER be removed or
broken off.This seriously compromises safety.
D Diisstto orrtte ed d o orr F Fu uz zz zy y S So ou un nd d
First, make sure the mixer (or signal source) is not clipping or being
overdriven.This can sometimes occur when the volume control (6) on the
LQ 10P has been set too low (too far counterclockwise), and it takes a lot
of signal to drive the unit to full power.
Make sure the input plugs are fully seated in the input jacks (5) on the rear
panel of the LQ 10P.
Check to see that the proper inputs are being used (5) for line level signals.
Make sure that a power amp has not been plugged into the input jacks of
the LQ 10P.
If an extension cord is being used to provide the AC power to the unit, is it
of sufficient current capacity and not also being used to supply power to any
other units? See “GETTING AC POWER TO THE LQ 10P” for details.
The LQ 10P has built-in EQ to extend and smooth the natural response of
the speakers in the system. Bass boost and HF EQ have been applied, and
the system has a nominally flat response and should require little, if any,
additional EQ. If excessive additional bass boost or HF boost have been
added externally to the LQ 10P, it may cause premature overload at high
SPLs.Try backing off any external EQ (mixer, rack equalizer) and see if that
clears up any tendency to distort.
TROUBLESHOOTING