Meyer Sound UP-4XP Instructions d'exploitation télécharger pdf (Page 12)

CHAPTER 2: UP-4XP LOUDSPEAKER

CAUTION: When wiring UP-4XP loudspeaker

cables, it is extremely important that each pin

be wired correctly. Make sure the 48 V DC from the

external power supply is wired directly (and only) to

the 48 V DC pins on the UP-4XP loudspeaker con-

nector, and that the polarity is observed (negative to

negative, positive to positive) to avoid damage to the

loudspeaker. In addition, make sure that audio pins

are wired correctly; polarity reversals for audio signals

affect system performance.

UP-4XP LED

The UP-4XP has a three-color LED on its rear panel that

changes color to indicate the loudspeaker’s status.

Powering On (Green)

When powering up the UP-4XP loudspeaker, the following

startup events occur and are indicated by the LED:

1. The LED flashes multiple colors during power-up

sequence.

2. After a pause, the LED turns solid green, indicating the

power-up sequence has completed and the loudspeaker

is ready to reproduce audio.

CAUTION: If after the power-up sequence the

LED does not turn solid green (instead flashes

multiple colors or stays solid red) and the UP-4XP

does not output audio, the loudspeaker has encoun-

tered an error and may need to be serviced. Contact

Meyer Sound Technical Support.

CAUTION: If after the power-up sequence (or

during operating) the LED turns solid red and

the loudspeaker continues to output audio, the loud-

speaker’s voltage may have dropped below 25 V DC.

When encountering these conditions, operation of

the loudspeaker should cease and its power supply

and cabling should be verified.

Limiting (Yellow)

The UP-4XP LED turns yellow to indicate limiting. When the

LED is solid yellow, limiting is engaged for the high-fre-

quency channel. When the LED flashes yellow (on and off),

limiting is engaged for the low-frequency channels. When

limiting is engaged for a channel, its gain is reduced. When

engaged, the limiter protects the loudspeaker’s drivers and

prevents signal peaks from causing excessive distortion in

the loudspeaker’s amplifier, thereby preserving headroom

and maintaining smooth frequency responses at high levels.

When source levels return to normal, below the limiter’s

threshold, the LED turns green and limiting ceases.

The UP-4XP performs within its acoustical specifications at

normal temperatures when the UP-4XP LED is green, or

when limiting is not continuous. If limiting activity is continu-

ous, the loudspeaker is nearing the limits of its operating

capabilities where:

■ Increases to the input level have no effect.

■ Distortion increases due to clipping and nonlinear driver

operation.

■ The drivers are subjected to excessive heat and excur-

sion, which will compromise their life span and may

eventually lead to damage over time.

CAUTION: The UP-4XP LED turns yellow when

the loudspeaker’s signal rises 2 dB above the

limiting threshold, and indicates a safe, optimum level

has been exceeded. If the UP-4XP loudspeakers in a

system begin to limit before reaching the desired

SPL, consider adding more loudspeakers to the sys-

tem to achieve the desired SPL without exposing the

loudspeakers to excessive levels and possible over-

heating.

UP-4XP Temperature and Limiting

The UP-4XP LED turns solid yellow when its heat sink tem-

perature reaches 65° C (145° F), indicating the unit is reach-

ing its maximum heat dissipation and a reduction in SPL is

recommended. While the UP-4XP will continue to operate

while the LED is yellow, the limiter threshold is lowered to a

safe level (causing the output level to be lowered by 3 dB) to

prevent the loudspeaker from overheating. When the tem-

perature of the heat sink cools to 50°C (122°F), the LED

changes from yellow to green and the limiter threshold

returns to normal.

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Meyer Sound UP-4XP Instructions d'exploitation Page 12

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