onkyo overheating ?

[marcipi]

Hi guys.Most of you werw very helpful to me when I asked which receiver was better to replace my old Denon AV 5600,considering Pioneer VSX-82 and the Denon 4308.The answer was almost unanimously the Onkyo 875 or the 905.However, I still haven´t decided because I have seen in some british sites that the 905 lets out too much heat,consumes a lot of energy and in fact some review the model as an oven in the room,that has burned outthe HDMI connections of the plasma TV,etc.As I live in a very hot cityand the energy is not cheap to have an air conditioning running all the time,I´m still
looking at the optios that i have here which includes also the Marantz 8001.
Do anyone of you have a review on the Onkyo,which is probably the best buy but seems to have this trouble.Thanks Marcipi

 

[MDS]

Review of the 805: http://www.hometheaterhifi.com/volume_14_3/onkyo-tx-sr805-receiver-9-2006-part-1.html

The reviewer said that the HDMI-CEC feature uses a lot of power and hence contributes to excessive heat. Most people don't need it and won't use it and it should be turned off.

There seem to be many criticisms about excessive heat with Onkyo lately. I've never owned any model higher than the 701 but excessive heat has never been my experience. The bigger and more powerful receivers will naturally dissipate more heat than the lower models but I'd bet that the majority of concerns are due to inadequate ventilation. If you are going to buy one of the top-tier models you probably should follow their recommendation of 8" free space above the receiver and 4" on each side and the back - yet nobody does and crams the thing into a small compartment.

 

[marcipi]

onkyo overheating

Thanks for your advice and the review indication that I duly read.Idon´t think that I have all that space free in my rack so I won´t be taking any chances for now.I know that Onkyo makes in these days probably the most modern receiver but i feel we should wait a little more time to know all the good and bad things about the 875 and 905.Thanks anyway for your opinion.Marcipi

 

[jcPanny]

Receiver heat.

Most modern receivers run hot and require adequate ventallation. My Yamaha receiver is currently used as a pre-pro, but it still gets much warmer than the Emotiva amp that is driving my speakers.

In energy and heat are a mojor factor then you might consider a digital switching amp or receiver. The efficiency is much higher than class A/B amplification. You could also turn off the power strip or power center when your gear is not in use.

 

[ParadigmDawg]

Yep; my Yammy gets pretty dang hot as a pre-amp and the EMO just sets there, cold as ice, no matter what I throw at it.

Most modern receivers run hot and require adequate ventallation. My Yamaha receiver is currently used as a pre-pro, but it still gets much warmer than the Emotiva amp that is driving my speakers.

In energy and heat are a mojor factor then you might consider a digital switching amp or receiver. The efficiency is much higher than class A/B amplification. You could also turn off the power strip or power center when your gear is not in use.

 

[davidtwotrees]

Yep; my Yammy gets pretty dang hot as a pre-amp and the EMO just sets there, cold as ice, no matter what I throw at it.

So, if your receiver is a pre amp.........and the amps inside aren't being used, what is heating up the unit? HDMI?! Neither of my amps or my prepro get hot, or even warm, for that matter..........

 

[Seth=L]

So, if your receiver is a pre amp.........and the amps inside aren't being used, what is heating up the unit? HDMI?! Neither of my amps or my prepro get hot, or even warm, for that matter..........

When the Yamaha's power supply isn't outputing anywhere near output capacity it runs hot. It has energy running around inside of it with no where to go. Preamps to have high output power supplies and run at a fairly steady output at all times when on, so they shouldn't get hot at all.

 

[zumbo]

And now, the rest of the story!

 

[rnatalli]

Yep; my Yammy gets pretty dang hot as a pre-amp and the EMO just sets there, cold as ice, no matter what I throw at it.

My EMO gets slightly warm only when pushing it for some time. Most receivers I've come across get pretty warm except some H/K's. They seem to run cool.

 

[rmk]

I owned an 805 for less than a week and it did run hot. Reports are that the 875 and 905 are the same or a bit worse in that regard. I returned the 805 as I was not happy with the sound quality and the HDMI connectivity. That said, I have an Integra 9.8 pre/pro on order that I will see some time in 2008 (if I'm lucky). Onkyo/Integra seem to be having some serious production issues and it is damaging their reputation.

 

[Cawdor]

I have an 875. I'm not concerned about the heat, though it does run warmer than the 20 year old Pioneer it replaced.

It is installed in a cabinet that is closed in the back and open in the front. Clearance is 3 inches above and behind, and 1 inch at each side. I read the posts about it running hot, so I installed two 80mm fans in the back of the cabinet to help with the cooling. It runs somewhat warmer than my Scientific Atlanta DVR/cable box.

 

[marcipi]

Onkyo overheating

Hi again.There`s a British site that puts together the Onkyo 805 vs the Denon 3808 and 905 vs the 4308,highliting both the positive and the negative angles of these sets.There´s no doubt that beside the video processing chip and the price,which goes for the Onkyo,it´s very hard to decide what´s the best choice.We don´t have the Integra in Brazil,just the Marantz,Denon,Yamaha and Pioneer among the well known receivers.The Brits,in their article says that Onkyo temp is very high and the Denon,medium.That´s one of the things I have Marcipito consider living in a tropical city.If you´re interested and don´t have yet,I can give the name of the site.Marcipi

 

[Nomo]

When the Yamaha's power supply isn't outputing anywhere near output capacity it runs hot. It has energy running around inside of it with no where to go. Preamps to have high output power supplies and run at a fairly steady output at all times when on, so they shouldn't get hot at all.

This brings up a question I've been wondering for a while now.
I've also found my Emo amp to run ice cold while my Yamaha 1500, which powers only the rear surrounds still runs as hot as it did pushing all speakers.
Is the the heat from the power supply with no where to go, as Seth puts it, causing potential damage to the unit?
If nothing else it certainly makes the feature to turn off the amp section on the Yamaha flagship RXV-11 look attractive. It would be disappointing to not see this feature migrate down into the lower tier models in the future.

 

[Seth=L]

Is the the heat from the power supply with no where to go, as Seth puts it, causing potential damage to the unit?

I would not be concerned about damage, transformers aren't prone to failing and if it gets to hot the fan should activate (I assume that it has one as most upper line Yamaha's do).

 

[Nomo]

Actually the 1500 is the oddball of the bunch in that it doesn't have a fan.
I'm not overly concerned about the issue, especially in my case as I have ample ventilation.

 

[Seth=L]

Actually the 1500 is the oddball of the bunch in that it doesn't have a fan.
I'm not overly concerned about the issue, especially in my case as I have ample ventilation.

Ha, ha, your receiver is an ugly duckling.

 

[Nomo]

Ha, ha, your receiver is an ugly duckling.

My receiver is sensitive we prefer airflow challenged.

 

[marcipi]

onkyo overheating

Hello,once more.Seth L is right about the fans.The Brits sites says that the 905 has two fans that will do their job if the temp gets too high.Although this is good news,I don´t know if it´s good enough to reassure us that everything is going to be fine.Iremember some coolers that failed and the processors,inside the CPU burned out pretty quickly.Even in autos engines that have sensitve chips to cool parts of the engines,you have always to keep an eye on them.That´s my fear with the Onkyos,watching movies and at the same time lookin´for the temp.Tks Marcipi

 

[Seth=L]

If the fans where to stop working it is likely the relay would trip and send the receiver into protect before excessive heat damage is done.

 

[PENG]

Is the the heat from the power supply with no where to go, as Seth puts it, causing potential damage to the unit?

The heat from the power supply has no where to go but OUT no matter what, it will heat up more if the power amp is in use, it is just a question of how much more heat it will produce but not less. This is just plain physics, no myth. The power supply, preamp, and other video circuits will all dissipate energy whether the power amp section is on or not. The fact remains, if the power amp is on but not outputting power, the unit in total will dissipates less energy than if the power amp section is in full use. However, the difference in overall heat produced in the reciever with or wihout the amp is use, is not as much as people think.

I think the real issue is, a receiver has so many things in it that produces heat, the power amp section is only a part of of it and probably a smaller part (say <10Watts r.m.s. on average) compared to the preamp and video sections etc. For the average home users, the music and movies they play typically don't demand a constant load, resulting in a low average power demand from the amp section. This is especially true for systems that crossover at 80Hz or above to the subwoofer.