NAD T763 protection mode issue

pmckeealaska
pmckeealaska Posts: 808
edited March 2006 in Electronics
Since I completed my LSi HT setup, I have had my NAD T763 reciever go into protection mode and shut down while running movies at high volumes. It is rated to handle a 4 ohm speaker load, so why does it go into protection mode? It has only happened twice, but I just wonder if I'm asking too much of this reciever. FYI, it only runs my LSiC and the LSiFX's, since I have a 2 channel amp for the mains (LSi25's).
Music and Movie Rig

Samsung 40" HDTV 1080p
LSi25 Front Speakers
LSiC Center Channel
LSiFX Surrounds
Rotel RB 1080 2-Channel Amp
NAD T763 Reciever
Denon DVD 2900 Universal Player
Audiosource 10 Band Digital Equalizer
Audioquest CV-8 speaker cables
Audioquest Sub-X subwoofer cables
Audioquest King Cobra Interconnects
Monster AVS 2000 Voltage Stabilizer
Playstation 3 120GB Slim
Post edited by pmckeealaska on
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Comments

  • pearsall001
    pearsall001 Posts: 5,093
    edited March 2006
    I have the T773 model for over 2 years now & absolutely love it. I never had to drive 4ohm speakers but that is what NAD is known for, great power & high current. I can't give you a reason why it goes into protection mode. Running your Polk's should not pose any problem at all for the T763. Do you have proper clearance all the way around to prevent over heating? If you do & it still goes into protection mode I would call or e-mail there cust service.
    "2 Channel & 11.2 HT "Two Channel:Magnepan LRSSchiit Audio Freya S - SS preConsonance Ref 50 - Tube preParasound HALO A21+ 2 channel ampBluesound NODE 2i streameriFi NEO iDSD DAC Oppo BDP-93KEF KC62 sub Home Theater:Full blown 11.2 set up.
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  • cfrizz
    cfrizz Posts: 13,415
    edited March 2006
    You are probably asking too much of the NAD. You should get separate amplification for the rest of your speakers.
    Marantz AV-7705 PrePro, Classé 5 channel 200wpc Amp, Oppo 103 BluRay, Rotel RCD-1072 CDP, Sony XBR-49X800E TV, Polk S60 Main Speakers, Polk ES30 Center Channel, Polk S15 Surround Speakers SVS SB12-NSD x2
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  • audiobliss
    audiobliss Posts: 12,518
    edited March 2006
    cfrizz wrote:
    You should get separate amplification for the rest of your speakers.
    Whether the amp is acting up and should be stout enough to power the three speakers or not, you should get separate amplification. More power is always better. :D
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  • cfrizz
    cfrizz Posts: 13,415
    edited March 2006
    Damn right!:D But the fact that the receiver is going into protect mode at high volume is a clear indication that it is being over worked & can't handle the load at high volume. And sometimes you just WANT to crank it up!
    audiobliss wrote:
    Whether the amp is acting up and should be stout enough to power the three speakers or not, you should get separate amplification. More power is always better. :D
    Marantz AV-7705 PrePro, Classé 5 channel 200wpc Amp, Oppo 103 BluRay, Rotel RCD-1072 CDP, Sony XBR-49X800E TV, Polk S60 Main Speakers, Polk ES30 Center Channel, Polk S15 Surround Speakers SVS SB12-NSD x2
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  • dorokusai
    dorokusai Posts: 25,577
    edited March 2006
    Is it a refurbished unit?

    Are you using soft clipping?

    How hot is the unit at shutdown? Is it in an enclosed rack? How much space on top AND the sides?

    It has fans correct? I would pop the top on it and check them.

    He certainly doesn't need additonal amplification.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • pearsall001
    pearsall001 Posts: 5,093
    edited March 2006
    I second what dorokusai said. Those other guys don't have a clue what they're talking about. Any of them ever owned a NAD? Your T763 can handle the Polk's w/ no problem. Could be a problem w/ the unit. Get in touch w/ cust. service.
    "2 Channel & 11.2 HT "Two Channel:Magnepan LRSSchiit Audio Freya S - SS preConsonance Ref 50 - Tube preParasound HALO A21+ 2 channel ampBluesound NODE 2i streameriFi NEO iDSD DAC Oppo BDP-93KEF KC62 sub Home Theater:Full blown 11.2 set up.
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  • dorokusai
    dorokusai Posts: 25,577
    edited March 2006
    I'm not saying anything about the aforementioned ideas....just that buying something new, is not part of troubleshooting a problem.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • pmckeealaska
    pmckeealaska Posts: 808
    edited March 2006
    The NAD is not in an enclosure, so I know its getting plenty of air. As far as I know, it doesnt have fans, but then again, I never checked that closely. I'll call customer service tommorrow.
    Music and Movie Rig

    Samsung 40" HDTV 1080p
    LSi25 Front Speakers
    LSiC Center Channel
    LSiFX Surrounds
    Rotel RB 1080 2-Channel Amp
    NAD T763 Reciever
    Denon DVD 2900 Universal Player
    Audiosource 10 Band Digital Equalizer
    Audioquest CV-8 speaker cables
    Audioquest Sub-X subwoofer cables
    Audioquest King Cobra Interconnects
    Monster AVS 2000 Voltage Stabilizer
    Playstation 3 120GB Slim
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  • Ferres
    Ferres Posts: 310
    edited March 2006
    With AV recievers, it is usually the front stereos are the ones rated for higher loads compared to the center and surrounds. Since all the speakers are 4 0hms, you'll really need separate amps for them. :P
    Gear: Rotel RC 1082, Rotel RSP 1068 pre/pro, Rotel RMB1077 amp, Cayin CDT 15a CD player, S301 bluray.

    Speakers: Tannoy DC sensys speakers, Paradigm Servo15 Sub, Velo Spl-1500r

    Conditioner: Isotek :D
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  • danger boy
    danger boy Posts: 15,722
    edited March 2006
    i'm thinking the NAD is being overtaxed.. all those speakers are 4ohm..and if you turn it up loud.. those speakers could draw alot more power from the receiver. putting into protect mode.

    Try getting a 2 or 5 channel external amp. and that should ease the load on your NAD. make sure the amp can handle 4ohm loads though.. not all of them can. My Adcom 5400 will, but at low volumes. before the overload lights begin to flicker.
    PolkFest 2012, who's going>?
    Vancouver, Canada Sept 30th, 2012 - Madonna concert :cheesygrin:
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  • dorokusai
    dorokusai Posts: 25,577
    edited March 2006
    All those speakers? It's 3 speakers....LSiC and LSi F/X.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • danger boy
    danger boy Posts: 15,722
    edited March 2006
    yeah, but they are still 4ohm. and you all know they can dip below that. 3 speakers or not.
    PolkFest 2012, who's going>?
    Vancouver, Canada Sept 30th, 2012 - Madonna concert :cheesygrin:
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  • shack
    shack Posts: 11,154
    edited March 2006
    Those who think the receiver is running out of gas are just wrong. Their gear is designed to push 2 ohm easily. That particular reciever is rated at 300wpc at 4 ohm. If it is going into protect, it is an issue with the receiver, not it's ability to drive the LSis.
    "Just because you’re offended doesn’t mean you’re right." - Ricky Gervais

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  • danger boy
    danger boy Posts: 15,722
    edited March 2006
    hmmpppffff! ok. so call NAD tech support then. sheesh.
    PolkFest 2012, who's going>?
    Vancouver, Canada Sept 30th, 2012 - Madonna concert :cheesygrin:
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  • pmckeealaska
    pmckeealaska Posts: 808
    edited March 2006
    Just got off the phone with a NAD techie. HE said that one of my speakers may be running at lower than 4 ohms on a consistent basis. He also said is may be the wiring (something about conductance, I dont remember specifically). He also said, he had heard of folks with monster wire having issues with this. My two mains are powered by monster cable. I originally had this problem when I was just running the mains, and then only rarely. I got a seperate 2 channel amp, and problem solved. I'll keep an eye on it and not run it too loud for too long on HT or surround. Most likely, I'll get a 3 channel amp at some point in the future.

    He suggested removing each speaker from the setup, power it up loud, and see if one speaker in particular is running below 4 ohms. He said if that is the case, I could ask for a new cross-over for that speaker. Does this sound reasonable? Sounds like a pain in the **** to me!
    Music and Movie Rig

    Samsung 40" HDTV 1080p
    LSi25 Front Speakers
    LSiC Center Channel
    LSiFX Surrounds
    Rotel RB 1080 2-Channel Amp
    NAD T763 Reciever
    Denon DVD 2900 Universal Player
    Audiosource 10 Band Digital Equalizer
    Audioquest CV-8 speaker cables
    Audioquest Sub-X subwoofer cables
    Audioquest King Cobra Interconnects
    Monster AVS 2000 Voltage Stabilizer
    Playstation 3 120GB Slim
    · Share on FacebookShare on Twitter