About the Protection Circuits
The CPM-300 features special circuitry to protect the CPM-300 and any connected devices. Whenever this is activat-
ed, the speakers are prevented from producing sound. Stop operation of the equipment, and immediately check to
find the problem.
1.Thermal Protection Circuit—Protects the Amp
Speaker output is cut if the temperature of the amp's heat sink exceeds 100 degrees C. Stop operating the equipment
for a short while to allow the heat to dissipate sufficiently.
→ Although the unit automatically restarts when the power amp's interior temperature falls, if the overheating pro-
tection circuit is activated again, check to make sure that the operating environment and connected output speakers
conform to the CPM-300's specifications. Minimum recommended load impedance for the CPM-300's power amp is
4 ohms.
2.DC Detection Circuit—Protects the Speakers
Whenever DC (direct current) is generated in the output sent to the speakers, the output is cut off, protecting the
speakers.
→ The CPM-300 restarts a few seconds after generation of direct current in the output ceases.
3.Muting Circuit—Protects the Speakers
When the power is switched on, output to the speakers is cut for a few seconds, thereby protecting the speakers
from the sudden noise that occurs when the power is switched on.
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