Speaker System Features And Usage

NUMBERS IN THIS SECTION REFER TO THE NUMBERED CONTROLS OPPOSITE

1) POWER INDICATOR: This LED indicates that the amp

is powered on normally, and should be capable of producing an

audio signal in concert with the attached speakers. If this light

and the signal light (#4) are both lit, yet no sound is present,

there is a fault condition, possibly blown loudspeakers. If this

light is on but the signal light (#4) is un-lit, this indicates that

there is no signal present at the input of the ampliﬁer, or the

ampliﬁer input section is damaged.

2) PROTECT: This Amber LED turns on when there is a fault

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condition in the system causing circuitry to engage in order to

protect the ampliﬁer and prevent it from damaging itself and/or

the attached speaker(s). The most common cause of this is run-

ning the ampliﬁer at or near its maximum output level for a

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very long time. If protection is engaged because of overheating,

the best course of action is to turn down the level control on the

ampliﬁer for long enough (10-15 minutes) to allow it to cool

off. After this time if the amp no longer turns on, it should be

turned off for 10 seconds and then turned on again. If it still

does not operate, contact your authorized service provider or

B-52 Pro-Audio.

3) LIMIT: This LED indicates the signal input is high enough

to drive the ampliﬁer into compression. Compression is the

artful limiting of the signal volume at the input stages, to prevent

the otherwise gross distortions that result from driving the power

ampliﬁcation beyond its design limits.

4) SIGNAL: This LED indicates the presence of audio at the

input stage of the ampliﬁer. If this light is not lit the sound will be

very low or nonexistant.

5) LEVEL CONTROL: Sets the volume of the ACT-1515X(F)

without inﬂuencing the level at the output XLR send.

6) OUTPUT: This connector is shorted to the INPUT allowing

daisy chaining of the input signal. Therefore you do not need

to y-cable out of your mixer or audio device to get an addi-

tional full range signal(s) to another active system nearby your

ACT-1515X(F) speaker system. Use this connector to “daisy

chain” multiple systems together. (See diagram on page 6 for

details)

7) INPUTS: This XLR connector accepts a balanced input

signal cable. Balanced means the signal is referred to a ground

whose voltage is always centered between the voltage present

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ETI Sound Systems, INC ACT-1515X(F) Speaker System Features And Usage, B-52 Pro-Audio, details

Models: ACT-1515X(F)