Denon AVR-4800 shutting off at mid volume

mark956101957
mark956101957 Posts: 6
edited October 2005 in Electronics
Hi, I have had the Denon AVR-4800 for several years and bought it used for $1200. Now when I play a DVD or a CD and turn the volume up even a little the Denon shuts off. It did not do that for the past few years but just started. On the TV it is OK with the volume up a little through the amp to my speakers but again at higher volume it switches off as if the circuit protector is shutting it down although the volumne is low. The TV is OK at lower volumes for hours. Anyone with ideas on what the problem might be? Anyone else have this problem and if so what can be done by myself to fix it. I really don't want the expense of taking it to a shop. Thanks....
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  • aaharvel
    aaharvel Posts: 4,489
    edited October 2005
    first and foremost- what speakers are you driving? Are they 8ohm or 4ohm?
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  • danger boy
    danger boy Posts: 15,722
    edited October 2005
    also check to see to make sure none of the speaker wires in the back of your Denon are touching. that is another way receivers go into protection mode and shut down. but aaharvel is probably spot on.
    If your speakers are putting to much of a power drain on your receiver. it will shut down every time.
    solution, get a two channel amp to take way some of the load from your Denon.
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  • mantis
    mantis Posts: 17,204
    edited October 2005
    If all that fails, check the rear speaker wires and see if you put a staple threw one of them. This causes most receivers to go into protection when you turn up the volume. I know this as I have done it in the past.

    Dan
    Dan
    My personal quest is to save to world of bad audio, one thread at a time.
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  • bknauss
    bknauss Posts: 1,441
    edited October 2005
    aaharvel wrote:
    first and foremost- what speakers are you driving? Are they 8ohm or 4ohm?

    I'd put money on this being the problem.
    Brian Knauss
    ex-Electrical Engineer for Polk
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  • mark956101957
    mark956101957 Posts: 6
    edited October 2005
    I have Polk Audio 4 ohm. I will check the wiring I have seen that happen before when I was setting them up. But when this happened I had changed nothing but it is easy enough to check all the wiring and go from there. Thanks.....
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  • aaharvel
    aaharvel Posts: 4,489
    edited October 2005
    Suck on that "scientific base" Eman.
    H/K Signature 2.1+235
    Jungson MagicBoat II
    Revel Performa M-20
    Velodyne cht-10 sub
    Rega P1 Turntable

    "People working at Polk Audio must sit around the office and just laugh their balls off reading many of these comments." -Lush
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  • polkatese
    polkatese Posts: 6,767
    edited October 2005
    aaharvel wrote:
    Suck on that "scientific base" Eman.


    :D:D:D
    I am sorry, I have no opinion on the matter. I am sure you do. So, don't mind me, I just want to talk audio and pie.
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  • ND13
    ND13 Posts: 7,601
    edited October 2005
    Do you have your tv's audio on fixed or variable? It should be set on fixed, so you're not sending too much input to the AVR. You shouldn't use the volume control from your tv. I'm not saying that you are, just don't know if your are or not. :)

    And from what I've learned about Denons around here, they aren't very happy driving 4 ohm speakers.
    "SOME PEOPLE CALL ME MAURICE,
    CAUSE I SPEAK OF THE POMPITIOUS OF LOVE"
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  • mark956101957
    mark956101957 Posts: 6
    edited October 2005
    ND13, thanks for the suggestions. I will check the audio mode out. But I have had the same setup with speakers as well for over two years without a problem and that with crankin the sound up so I am hard pressed to see it as the ohms of my speakers?
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  • aaharvel
    aaharvel Posts: 4,489
    edited October 2005
    Mark I would suggest you contact Denon. If the receiver is only 2years old, then it should still be under warranty. Welcome to the forums btw.

    Hunter/Killer 4 life! :cool:
    H/K Signature 2.1+235
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    Revel Performa M-20
    Velodyne cht-10 sub
    Rega P1 Turntable

    "People working at Polk Audio must sit around the office and just laugh their balls off reading many of these comments." -Lush
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  • reeltrouble1
    reeltrouble1 Posts: 9,312
    edited October 2005
    I'd bet its not your speakers.

    If you have checked your wiring then yes, call Denon, they will put you through a punch list, if it clears the checks (like wires, etc.) then you will likely be in need of repair. You could pop the hood and take a look for obvious signs of trouble, but since it is working initially I kind of doubt anything will jump out, but my be worth a shot.

    You may very well need to send it for service.

    RT1
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  • mark956101957
    mark956101957 Posts: 6
    edited October 2005
    Thanks for the replies. My Denon is actually 5 years old or so and I bought it as refurbished and had to take it in while under warranty cause it was shutting down. And now the same 5 years later. If I take all the speaker wiring off my reciever and turn it up some should it still turn off or not? And if it turns off does that take the speakers out of the equation as the problem?
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  • WilliamM2
    WilliamM2 Posts: 4,782
    edited October 2005
    They will also shut down if they get too hot. Does it have a cooling fan? If so, it may not be working.
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  • mark956101957
    mark956101957 Posts: 6
    edited October 2005
    William, good point, yes it does having a cooling fan and that thought crossed my mind but I haven't looked into it yet but I will. Thanks
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  • tdeluce
    tdeluce Posts: 107
    edited October 2005
    aaharvel wrote:
    Suck on that "scientific base" Eman.

    This happens for a very scientific reason :-)

    Current is equal to voltage divided by resistance.

    Lower the resistance then you increase the current.

    Increase the current beyond the capability of the
    receiver and, ah, well, it shuts off to protect itself
    from damage :-)
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  • twochannel
    twochannel Posts: 171
    edited October 2005
    Most Denon receivers are rated for a 8 ohm load. You will not be able to run Lsi's or Sda's for any length of time until the unit heats up and possibly shuts off. I have seen Denon receivers play for years with 4 ohm loads, as long as they were not at loud volumes.
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