Denon heat question

[nosferatu]

I have Denon 2808Ci with full Vienna Acoustics HT speakers. I have recently added Emotiva amp (upa5) to drive the speakers , since my Denon was running hot , and to take the load off the receiver . now with the amp driving the speakers my Denon still runs hot . i did audyssy Auto calibration and the Denon seem to run even warmer after that . is this how it should be, or is there a way to disengage Denon amps.

thank you

 

[PENG]

I have Denon 2808Ci with full Vienna Acoustics HT speakers. I have recently added Emotiva amp (upa5) to drive the speakers , since my Denon was running hot , and to take the load off the receiver . now with the amp driving the speakers my Denon still runs hot . i did audyssy Auto calibration and the Denon seem to run even warmer after that . is this how it should be, or is there a way to disengage Denon amps.

thank you

That tells me you were not using a lot of power even before you added the upa5. The heat you are getting are mainly from the prepro section, the transformers, the audio/video chips, probably a total of around 80 to 120W. Think about the heat that even a 60W incandescent light bulb can generate. So not to worry but make sure you have adequate ventilation for the Denon, such as at least a few inches of space all the way around.

 

[nosferatu]

here are few pictures of the HT . i have about 3 inch gap on top of the denon.I was hoping for the Denon to run cool after adding the external amp.

 

[anamorphic96]

I would just like to second Peng's comments. Most of the heat from my receiver comes from the HDMI and video processing sections.

 

[BoredSysAdmin]

It looks like you might need to make fan mod to the back of this media cabinet

 

[PENG]

I know for sure in my 7.1 application most of the time the amps output no more than 10 to 20W of average power. Even at an overall efficiency of say 30%, the amp section would consume no more than 66W, more likely much less, say below 35W most of the time. Besides, even if the internal amps are not used, they will still produce some heat just idling. So yes, adding an external amp will not help much in reducing the overall heat produced.

From the photos I cannot tell if the Denon is in one of the closed cabinets on the sides. If it is then you need to do something to provide forced ventilation.

 

[nosferatu]

when i use HT i open up the doors , it seem as denon gets3x as hot as emotiva that runs almost cool the the touch.

also is there any advantages of upgrading 2808Ci to a newer receiver. I know it has all the decoders needed , but are there any improvements that newer receiver could make ?

 

[jeannot]

In case it is an air circulation issue, I would temporarily move the Denon to the top of your stand to rule that out.

If it still runs really hot, there is a slight chance that the bias current in one or more channels of your amp is too high. A technician will be able to adjust these for you, it's the simplest adjustment there is in an amp.

You are right to worry, because excessive heat will impact the life of your receiver.

Good luck.

 

[jeannot]

... is there any advantages of upgrading 2808Ci to a newer receiver. I know it has all the decoders needed , but are there any improvements that newer receiver could make ?

Slim to none. You have a pretty good receiver now, and since you're using an external amp there is no point upgrading for power.

The only upgrade really would be HDMI 1.4a compatibility, which more or less is the ability to play 3D movies, but you'd need the 3D compatible blu-ray player and the 3D TV... Also, a networkable receiver is a fun thing.

My 2 cents.

 

[BoredSysAdmin]

... when i use HT i open up the doors ...

To me it sounds approx like this :

My suggestions stands.
Option B: use IR Repeater/RF to move AVR and amp amd rest of equipment to different location (basement?) and run 12 gauge speaker wire to speakers...

 

[DenPureSound]

That tells me you were not using a lot of power even before you added the upa5. The heat you are getting are mainly from the prepro section, the transformers, the audio/video chips, probably a total of around 80 to 120W. Think about the heat that even a 60W incandescent light bulb can generate. So not to worry but make sure you have adequate ventilation for the Denon, such as at least a few inches of space all the way around.

Peng is right on the money. I was told by Denon that my AVR-3311CI is consuming around 90 Watts just for the a/v processing section with the amps (7) of them that are biased and on even though they are sourcing no current to speakers, as there is no way to shut them off by themselves. I am running the Emotiva XPA-5 (which runs very cool) to the touch, compared to the Denon which runs very warm even with around 3" above it and the front/rear of the a/v rack open to ambient temps. Even though the Denon runs very warm it has not Protected itself, except when I was running with no external amp, and driving five speakers off the Denon at +12db above reference. With the addition of the amp, all is well now.

 

[Rickster71]

I would've hoped as you did, that a receiver would run cooler with so much of the load removed.

I have computer fans on the tops of every receiver I own.
Regardless where the heat is coming from, it's best to vent it up and out with a fan. If you don't have vents or slots in the bottom of your rack, it would help to add them. My cabinet has sliding back panels and I've also removed them completely.

 

[PENG]

I have computer fans on the tops of every receiver I own.

Me too, I use a very quiet one. The same quiet computer I used to vent my 4308 is now sitting on top of my AV7005 and keeping it really cool. Amps do run cooler than prepro/tuner if one does not listen very loud, simple math will tell us why.

 

[PENG]

I was told by Denon that my AVR-3311CI is consuming around 90 Watts just for the a/v processing section with the amps (7) of them that are biased and on even though they are sourcing no current to speakers, as there is no way to shut them off by themselves.

That's not bad at all. The Onkyo PR-SC5508 consumes 110W, and that's without any power amp bias current to worry about.

The only mid range Denon I know of that allows shutting off the power amp section is the AVR-4311, again, that would probably save 10W or less.