Question about Denon DRA-685 Receiver
I have this reciever hooked up in a small office with speakers throughout.
The reciever goes into a "protection mode" when turned on and in not useable. I have checked all speaker connections to the rear of the unit. Is ther a way to override this?
Could it be that the speakers load is too much for the amp to handle? What are the ohm ratings? It should handle a low load but I am just wondering? How effcient are they?
Posted on Mar 29, 2008
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Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
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