Meyer Sound M'elodie, Operating Instructions Manual

13

CHAPTER 3

M’elodie is performing within its acoustical specifications 
and operating at a normal temperature if the limit LEDs are 
lit for no longer than two seconds, and then go off for at 
least one second. If an LED remains on for longer than three 
seconds, that channel enters 

hard limiting

, with the follow-

ing negative consequences:

■ 

Increasing input level will not increase volume.

■ 

Distortion increases due to clipping and nonlinear driver 
operation.

■ 

The lifespan of the driver is reduced because it is sub-
jected to excessive heat and/or excursion, and eventual 
damage over time may occur.

NOTE:

The limiting circuitry utilizes optical 

limiters that add no noise and have no effect 

on the signal when the limiter is not engaged and 
the LED is inactive.

COOLING SYSTEM

The M’elodie amplifier modules rely solely on natural 
convection for cooling. The heatsinks used in the amplifier 
modules allow natural convection cooling from air flowing 
over the heatsink. The efficient design of the amplifier and 
heatsink profile helps keep the temperature on the amplifier 
low even when the loudspeakers are being used at high 
ambient temperature, in tightly packed conditions, and/or at 
high continuous levels.

If the temperature of the heatsink reaches 75° C (167° F), 
the On/Temp. LED on the rear panel turns from green (On) 
to red (Temp.). The unit continues to operate normally even 
if the On/Temp LED is red, but this is an indication that the 
unit is reaching its maximum dissipation. A reduction of the 
SPL is recommended at this point.

NOTE:

In the highly unlikely event that the 

heatsink temperature reaches  95˚ C (203° F), 

the M’elodie loudspeaker automatically shuts down 
until AC power is removed to allow the heatsink to 
cool down. If the M’elodie loudspeaker shuts down 
again after cooling and reapplying AC power, con-
tact Meyer Sound for repair information.

CAUTION: 

The heatsink can reach 

temperatures of up to 95° C (203° F) during 

extreme, high-level operation for extented periods of 
time. Use caution when approaching the rear of the 
cabinet.

CAUTION:

 To keep the heatsink from getting 

too hot, ensure proper ventilation around the 

loudspeaker.

When the heatsink temperature decreases to 65° C (145° F), 
the On/Temp LED changes from red to green.

CAUTION:

 If loudspeakers in a system begin 

to shut down due to excessive heatsink 

temperatures before reaching the required SPL, 
consider adding more loudspeakers to satisfy the 
SPL requirements.

TIP: 

The RMS remote monitoring system 

can be used monitor the temperature of the 

heatsinks.