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93cbra
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Reciever keeps shutting down at loud volumes (but I'm using monoblocks)

Hey guys, first of all this is what I have:
Onkyo SR702 reciever
Titanic 15" sub
Polk RTI-12 left/right speakers (got these because I wasn't getting the tight bass that I wanted when listening to music)
2 Outlaw 2200 monoblock amps powering my RTI 12s
4 Polk surrounds

My problem, when I bought the RTI 12s I knew that the Onkyo wouldn't be powerfull enough to power them plus when I turned the Onkyo up too loud (only when listening to music) it would shut off. So, I bought the 2 Outlaws to power my RTIs (I wanted it really loud, figured it would be unbelievable when playing rockband on XBOX and when listening to music). Anyways, with the Outlaws it is a bit louder but nowhere what I thought it was going to be, not that much louder than what my Onkyo was doing. On top of that the reciever still shuts down when I turn it up too loud (over 70) listening to music (yes I listen to it very loud). I have nothing connected to the L/R speaker outputs on the Onkyo, the outlaws are connected to the "front left and right" pre outs.

Does this make sense, should the Onkyo be shutting down like this when turned up over 70 (which isn't crazy loud) and shouldn't I be getting a huge boost in volume with the Outlaws and RTIs?

Any help?

Thanks,
Jeff

mrlowry
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Re: Reciever keeps shutting down at loud volumes (but I'm using

Even though the Onkyo's amplifiers aren't being used to power speakers they are still powered up and functioning. If there is a protection circuit in the amplifiers sensing distortion it might still turn the unit off. Also the unused amplifiers may be creating heat. It's hard to say.

Polks and Onkyo are a bad match if the goal is to play LOUD. Polks require a little more power to get to the same volume as comparable speakers and Onkyo receivers have never been known for driving difficult loads.

I'm not knocking either product. They are both nice units just the wrong tools for this job. Klipsch speakers would have been the a much better choice to play loud with very little power. My guess would be that Klipsch speakers with the Onkyo would play louder than the Onkyo/Outlaw/Polk by a very, very wide margin.

Jan Vigne
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Re: Reciever keeps shutting down at loud volumes (but I'm using

How hot is the Onkyo when it shuts down? Move the unit from its present location to provide better air flow and check for problems. If this doesn't solve the problem, unplug everything except a source and try to get the receiver itself to shut down.

Yep, if you want really loud, the Polks are a poor choice. You need some thing about 10dB higher in electrical sensitivity. Klipsch and JBL are two mass market brands that have higher sensitivity. You have found out just how buying power works. You have to buy twice as much real power to make an audible difference, this will give you approximately 3dB of volume increase. Three dB is about where you can notice a difference and not much more. You need to buy approixmately ten times the real power to get ten dB - or twice as loud - which is where most people find a real difference. All of this gets distorted in real life by the dynamic nature of music. Better to get your volume from high sensitivity speakers than by buying more watts.

http://myhometheater.homestead.com/splcalculator.html

mrlowry
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Re: Reciever keeps shutting down at loud volumes (but I'm using


Quote:

http://myhometheater.homestead.com/splcalculator.html

Wow, Jan that link is killer. Good point about ventilation.

93cbra

Are the top vents blocked? They should have at least 2 to 4" of clearance

Is the unit in a closed cabinet?

JIMV
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Re: Reciever keeps shutting down at loud volumes (but I'm using

hturning off sounds like a heat problem. I own a modest Onkyo receiver for my TV system and it has never shut down, though I do not listen a painful levels.

perhaps moving the receiver from the other gear and improving air flow might make a difference.

rvance
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Re: Reciever keeps shutting down at loud volumes (but I'm using


Quote:
I have nothing connected to the L/R speaker outputs on the Onkyo, the outlaws are connected to the "front left and right" pre outs.

Is the receiver trying to run these two channels without a load? Or do the pre-outs disable the l/r fronts? I don't know, so I'm asking the experts here.

93cbra
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Re: Reciever keeps shutting down at loud volumes (but I'm using

Thanks for the great info guys. The Onkyo is on a open glass shelf but only has an inch or so clearance from the shelf above it. I'll try moving it off the shelf and possibly putting a temporary fan on it. I'll keep the Onkyo/Polk advice in mind if I decide to replace the unit.

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