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ONKYO receivers running hot??

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Old 02-13-2009, 08:41 PM   #16  
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Meanwhile, back to the thread . . . .

As a few others have posted, heat is a byproduct of any electronic or electrical equipment.
Now, audio amplifiers are a lot like light bulbs . . . you can figure that more than 95% of the energy consumed is given off as heat.
An audio amp does NOT consume power proptionately to its output - which is to say that it doesn't matter whether the volume is low or high, the power consumption is approximately the same (that's just the nature of linear, or class A, amplifiers).

So just figure that if your audio amp is rated at 200W it's going to give off about as much heat as two 100W incandescent bulbs;
likewise, a 400W amp will give off about twice as much; and an 800W amp twice again.
Anyway, the heat is going to be there and it's going to be directly proportional to the rated power consumption of the equipment.
How much space do you guys recommend around your receivers??? I like atleast 4 inches above my receiver for airflow? Is that enough or should there be more?
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Old 02-13-2009, 09:30 PM   #17  
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How much space do you guys recommend around your receivers??? I like atleast 4 inches above my receiver for airflow? Is that enough or should there be more?
4 inches should be enough as long as the warm air has a way out through the back of the unit. I have my Denon on a top shelf of a rack in open air.
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Old 02-13-2009, 10:19 PM   #18  
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4 inches should be enough as long as the warm air has a way out through the back of the unit. I have my Denon on a top shelf of a rack in open air.
Yeah my shelf is open in the back and front. My 806 doesn't have much room on the sides but the front and back are open and there is about 4.5 inches of clearance on the top of my receiver.
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Old 02-14-2009, 12:16 AM   #19  
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4 inches should be enough as long as the warm air has a way out through the back of the unit. I have my Denon on a top shelf of a rack in open air.
Actually, the most important ventilation is on the top of the receiver but it does need some where to go once it goes up. receivers/amps use the natural convection of heat rising to draw air in from the bottom and have it pass through and out the top all the while cooling the components inside as the cooler air from below flows through.
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Old 02-14-2009, 07:42 AM   #20  
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Actually, the most important ventilation is on the top of the receiver but it does need some where to go once it goes up. receivers/amps use the natural convection of heat rising to draw air in from the bottom and have it pass through and out the top all the while cooling the components inside as the cooler air from below flows through.
I should have been more clear when I said "back of the unit". I was referring to the cabinet as the "unit". I can see how it read now..

I learned years ago about putting the AVR at the top. My old 5.1 Onkyo was on the second shelf with a Denon DVD player above it. The Denon would shut down periodically. I noticed/felt the heat on the player itself was damn hot.. so I re-arranged the components and cut out some holes in the old cardboard type backing of the el-cheapo cabinet and that took care of it.
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Old 02-14-2009, 02:38 PM   #21  
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The Onkyo manual calls for 8" on top and sides and 4" at the rear with rear edge of the shelf above the 805/6 ending 4" from the wall to create a "flue-like gap for warm air to escape". see page 2 paragraph 18 (in my 805 manual)
As you know, the 805/6 is huge. It would seem Onkyo basically wants the the unit on a table with nothing around or over it. Very impractical. I have 2" top and sides with short shelves above AND a fan. No glass doors, the front is open. Oh, and another fan for the Motorola STB which, as pointed out, runs as hot as the Onkyo.

One last thought for the Moverdear, the Onkyo has a way of measuring the internal temp.
Turn the Onkyo "ON", hold down "Display" while pressing "Standby" once, release "Display" and press "Tone" once. Takes a little practice to get the rhythm just right, but it will then display:

T:20/20 FAN:--
V:0.00 SEC:M

The 20 is the internal temp in C (room temp). As the unit warms up, this number and the next one will increase. Body temp is 37C (98.6F).
If you do not press the "Tone", the firmware and DSP will be displayed.
This is on my 805, I am assuming the 806 is the same or similar.
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