Meyer Sound 1100-LFC Operations Instructions download pdf (Page 17)

1100-LFC OPERATING INSTRUCTIONS

by allowing the driver to produce the maximum SPL across

its entire frequency range. TruPower limiting also eliminates

power compression at high levels over lengthy periods,

which helps regulate voice coil temperatures, thereby

extending the life of the driver.

NOTE: Since TruPower limiting only reduces

signal levels to keep voice coil temperatures

under a safe margin, signal peaks remain unaffected.

LF Limit LED

The two low-frequency drivers for the 1100-LFC are pow-

ered by separate amplifier channels that are routed to a sin-

gle limiter. When a safe power level is exceeded in either

channel, limiting is engaged for both channels and the LF

Limit LED lights.

When engaged, the limiter not only protects the drivers but

also prevents signal peaks from causing excessive distor-

tion in the amplifier channels, thereby preserving headroom

and maintaining smooth frequency responses at high levels.

When levels returns to normal, below the limiter threshold,

limiting ceases.

The 1100-LFC performs within its acoustical specifications

at normal temperatures when the LF Limit LED is unlit, or

when the LED is lit for 2 seconds or less and then turns off

for at least 1 second. If the LED remains lit for longer than

3 seconds, the loudspeaker enters hard limiting 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 LF Limit LED indicates when a

safe, optimum level has been exceeded. If an

1100-LFC begins to limit before reaching the required

SPL, consider adding more units to the system.

NOTE: The 1100-LFC loudspeaker uses an

optical limiter that adds no noise and has no

effect on the signal when the limiter is not engaged

and the LF Limit LED is not lit.

AMPLIFIER COOLING SYSTEM

The 1100-LFC uses forced-air cooling with six ultrahigh-

speed fans (three primary, and three reserve) to prevent the

amplifiers and power transformer from overheating. The fans

draw air in through ducts on the rear of the cabinet, over the

heat sinks, and out the rear of the cabinet. Because dust

does not accumulate in the amplifier and power circuitry,

their life spans are increased significantly.

CAUTION: To keep the 1100-LFC from over-

heating, allow at least 6 inches behind the

loudspeaker for proper ventilation.

NOTE: In the unlikely event that the 1100-LFC

power transformer reaches a temperature of

127° C, the limiter threshold is reduced by 3 dB.

When the temperature cools to 107° C, the limiter

returns to its normal threshold.

CAUTION: If an 1100-LFC consistently over-

heats before reaching the desired SPL, con-

sider adding more units to the system.

TIP: When the 1100-LFC is connected to an

RMS network, the RMS software provides feed-

back on the loudspeaker’s operating temperature.

For more information, see Chapter 5, “RMS Remote

Monitoring System.”

1100-LFC Fans

Primary Fans Reserve Fans

Type Ultrahigh-speed Ultrahigh-speed

Number 3 3

Location 1 for each heat sink (2);

1 for power transformer

1 for each heat sink (2);

1 for power transformer

Fan speeds

and heat

sink temp.

<34° C Half speed <52° C Off

34° – 50° C Ramps up >52° C Full speed

50° – 84° C Full speed <44° C Off

>95° C Audio

muted, fans

continue at

full speed

>95° C Audio

muted, fans

continue at

full speed

<86° C Audio

unmuted,

fans con-

tinue at full

speed

<86° C Audio

unmuted,

fans con-

tinue at full

speed

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 39 40

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Meyer Sound 1100-LFC Operations Instructions Page 17

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