JBL PRX712/230 Specifications download pdf (Page 21)

21

Hum or Buzz that

increases or decreases

when the mixer level

controls are moved

Improper A/C ground or

faulty equipment

connected to mixer input

Disconnect or mute channels one at a time to

isolate the problem. Refer to the owner’s manual of

the faulty equipment for troubleshooting help.

Faulty cable between

source equipment and

mixer

Substitute a known-good cable for the suspected

faulty cable.

Hum or Buzz

Improper A/C grounding,

ground loops

• “Telescope” the audio ground by using an XLR/F

to XLR/M adapter on one end.

• Re-route audio cable away from AC power and

lighting cables.

Excessively long

unbalanced cable run

• Use the balanced outputs (if available) of your

mixer or source equipment to drive your

EON speakers.

• Use a “DI” (direct injection) box to convert

your unbalanced equipment output to a

balanced output.

Improper system gain

structure

Review the Owner’s Manual for your system

setup and adjust controls as needed.

• Input sensitivity (gain)

Speakers feedback and

howl when the microphone

volume is turned up

Microphones are pointed

into the speakers

Move the speakers so they do not point to the

microphone’s pickup pattern.

Equalizer settings are

incorrect

Locate the feedback frequency and reduce it

using the mixer EQ or an external equalizer.

Excessive gain

Reduce the gain at the mixer and move the

microphone closer to the sound source.

Too much low frequencies

when playing back

prerecorded music

Recorded music

with excessive

low frequencies

Switch the EQ switch to “at.”

Section 7: Connection Types

1 2 ... 16 17 18 19 20 21 22 23 24

Comments to this Manuals

No comments