I have a Denon AVR-2307 surround receiver with Mirage Omnisat V2 Series floorstanding front speakers and the Omnisat V2 Centre speaker plus Niles HD6 in wall surround speakers.
Now for the second time the receiver has gone into protection circuit mode. The first time the resistors and diodes were replaced in front left and centre output stages under warranty.
Now that this has happened a second time I have been investigating and wonder whether I have an impedance mismatch issue with the receiver and the speakers.
The receiver is rated front A,B at 100w + 100w (8 ohms, 20hz -20 khz), centre 100w (8 homs, 20hz - 20khz), surround is the same.
According to the manual, the impedance on all the speakers is 6 - 16 ohms.
The Mirage front speakers are rated at 175 watts and their impedance is 8-ohm nominal and 4 ohm min. The centre speaker is the same. The Niles surround speakers are rated at 10 to 125 watts per channel and their Nominal Impedance is 6 ohms.
Both times when this has occurred it has been whilst playing music DVD's at high volume, but not extreme. So, I am wondering if the amp has had to be pushing too much power over the period and it has clipped and damaged the circuitry? Can you advise if this is possibly the case.
The system was sold to me by an authorised Denon dealer in Adelaide South Australia and if there is a mismatch I am wondering if I have any comeback on them?
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While working it stops and flashes red approximately
2 seconds interval Causes Protection circuit is activated
depending on the temperature of the surroundings Remedy Switch off the power supply and power on
after the temperature have reduced. While working it stops and flashes red approximately
0.5 seconds interval Causes 1.Using speakers having less impedance
than the specified. 2.If speaker core wire touch each other Protection
circuit is activated Even applying power red flashes 0.5
seconds interval Cause Amplifier circuit has failed Remedy Switch off the power and contact denon
Is it possible for you to lower the source level? if yes go ahead...
There is an automatic Dialogue normalisation function in Denon which is activated to reduce overly bright input signals. ( most movies have wide variation in sound levels and therefore this function is avaialble). (see page45 of your user manual).
When your system worked fine with the AVR 2808CI, then why is it giving problem with AVR 3808CI....???? You must ask Denon.
Protection circuits are activated when:
1). There is rise of internal temperature.
2).Core wires of the speakers are touching each other or a core wire is sticking out of the terminal and touching the set's rear panel or the speaker itself has a problem.
3). Speakers with an impedance other than specified are being used.
4). the set is damamged or has bad solder / dry solder connection .
If your AVR is new, please do not accept, the set could be faulty. The protection circuits should not be activated unless any of the above happen.
You must know, at times the protection circuits are not fast enough and it could burn some of the transistors on the power output circuit. With time, the solders on the circuit board could give way and give you problems later on.
You must sort out with Denon if the AVR is under warranty.
It may seem obvious, but have you checked the display dimmer settings? Under the front cover is a button marked dimmer. Pressing it cycles through progressive display dimness settings until it goes off. One more press goes back to full brightness.
More than likely the protector circuit is getting activated... You can't go below 6 ohms on the surround back which means you need 12 ohm or higher speakers for outside (since the two outputs for surround back/zone2 are in parallel). As a simple diagnostic test, disconnect one speaker and see if the sound survives longer than 2 seconds.