Apogee APL-10 Spécifications télécharger pdf (Page 28)

The system exhibits hum or noise

PROBLEM

POWER LED illuminates but

audio is not present

SUGGESTIONS

• Check to be sure that the signal feed cable has audio present.

This can be done by plugging it into a speaker/amplifier that is

known to work, or, by using a portable powered

headphone/amplifier test set such as the Shure

™ FP22.

• Make sure the signal feed cable is securely mated with the

XLR input connector.

• Substitute an alternate cable to determine if the cable is at

fault.

• Disconnect the input cable. If the hum or noise ceases, the

problem is either in the source, or it may be caused by a

ground loop created when the source is connected to the APL-

10/12. Listen to the source with an alternate speaker/amplifier

or a headphone test set, to determine if the source is clean.

• If the source is clean, try installing an XLR ground lift adapter

to the input cable.

The audio sounds compressed or

distorted and the limit light is

NOT registering.

• Check the input source with an alternate speaker/amplifier or

a headphone test set, to determine if the source is clean.

• Check to be sure the input cable is properly mated.

• Listen to an alternate source with the same APL-10/12 to

determine if the source or the loudspeaker is malfunctioning.

The audio sounds compressed or

distorted and the limit light is

registering.

• Reduce the drive level to the speaker system.

• Increase the number of loudspeakers used in the system if the

desired level cannot be obtained with the present number of

loudspeakers.

DO NOT, UNDER ANY CIRCUMSTANCES,

ATTEMPT TO LIFT THE AC GROUND CON-

NECTION! LIFTING THE AC GROUND COULD

RESULT IN INJURY OR DEATH!

Troubleshooting

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Apogee APL-10 Spécifications Page 28