Crest Audio LQ 10P user manual Troubleshooting, Hum or Buzz, Distorted or Fuzzy Sound

TROUBLESHOOTING

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.

Hum or Buzz

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.

Distorted or Fuzzy Sound

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.

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