Free Shipping on All Orders 1-866-764-1801

Vist our Online Store
+ Reply to Thread
Results 1 to 16 of 16
  1. #1

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Location
    Tampa Bay
    Posts
    313

    Default Help! Catching A Buzz!

    With all components powered up I have a buzz coming from both front and the middle speakers. The buzz does not react to volume changes and I don't hear it in the surrounds.

    I was thinking that it was a problem in the amp (NAD T955) but Saturday I switched the receiver's (Onkyo 707) center spkr preout cable from the channel 3 input on the NAD to channel 5 input and the buzz followed to that spkr.

    I then changed out the cable between the receiver's center out and the amp's channel 3 in ... no effect. Still had the buzz.

    Sometimes the buzz is a bit lounder than other times, either way, it's p'n me off that I can't find the source.

    Any and all help appreciated.

    Thanks,

    Dave
    Marantz AV7005
    Marantz MM7055
    Onkyo DX-755 CdP
    Oppo BDP-93
    Technics SL-1301/Shure M97xE
    Polk RTi A7s
    Polk CSi A6
    Polk FXi A6s
    Velodyne VDR10-BV
    Panamax M5100-PM
    Antec VERIS A/V Cooler x 2

  2. #2

    Member Sales Rating: (0)

    Join Date
    Dec 2012
    Location
    Cleveland, Ohio
    Posts
    323

    Default

    Standard trouble shooting procedure is to start as simple as possible and add components one at a time.

    a] Disconnect all the interconnects and power cords.
    b] Connect the amps power cord and speaker wires.
    c] Use a battery powered music source into the amp. Does it hum?
    Use a single AC power outlet strip when plugging in more components.
    d] Connect your controller's power and the interconnects to the amp. Use a battery powered music source into the controller. Does it hum?
    e] Continue adding components one at a time until it starts to hum.

  3. #3

    Member Sales Rating: (0)

    Join Date
    May 2010
    Posts
    2,366

    Default

    Helping one catch a buzz could turn out to be illegal, or not.Name:  smiley_rotflmao.gif
Views: 202
Size:  4.4 KB

  4. #4

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Location
    Tampa Bay
    Posts
    313

    Default

    'Skater - Appreciate the input but I've no idea how to introduce a battery-powered music source into the amp. I mean the NAD has no other inputs other than the 5 cable inputs from the preamp (in this case the Onkyo receiver's preouts). So don't think that step is possible with my stuff.

    I am using a single source power supply, the Panamax.

    Re "controller," do you mean the Onkyo? I actually kind of suspect it to be the culprit since it's sending that center speaker signal to the amp - but then why would the two fronts also buzz? (I ask myself)

    At this point I'm starting to think that because the "buzz" is a buzz. Seemingly fixed and unaffected by volume adjustments. Not a hum (oh how I wish it were a hum only) and kind of intermitant, the issue must be in the power amplifier.

    I have one more troubleshooting step to take - maybe tonite, that is connecting the center speaker directly to the Onkyo's center spkr terminals - not using the amp, and seeing if the buzz is present.

    If so, I think I have a source problem. If not, it likely resides in the amp.

    Opinions on this idea?
    Marantz AV7005
    Marantz MM7055
    Onkyo DX-755 CdP
    Oppo BDP-93
    Technics SL-1301/Shure M97xE
    Polk RTi A7s
    Polk CSi A6
    Polk FXi A6s
    Velodyne VDR10-BV
    Panamax M5100-PM
    Antec VERIS A/V Cooler x 2

  5. #5

    Member Sales Rating: (0)

    Join Date
    Dec 2012
    Location
    Cleveland, Ohio
    Posts
    323

    Default

    As for a battery powered music source, looking around my house I see a little old CD player, an Ipod and a Clip (anything with an analog output or a headphone output. Get a suitable adapter interconnect cord and you can test two channels at a time.

    Yes the Onkyo is what I called a controller. I think of a receiver as having a speaker power amplifier output.

  6. #6

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Location
    Tampa Bay
    Posts
    313

    Default

    NAD's going to the shop. Will post results ...
    Marantz AV7005
    Marantz MM7055
    Onkyo DX-755 CdP
    Oppo BDP-93
    Technics SL-1301/Shure M97xE
    Polk RTi A7s
    Polk CSi A6
    Polk FXi A6s
    Velodyne VDR10-BV
    Panamax M5100-PM
    Antec VERIS A/V Cooler x 2

  7. #7

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Location
    Tampa Bay
    Posts
    313

    Default

    NAD back from the shop. Turns out the #4 amp is shot. That's the 2nd time an amp has blown and the first time a component I've owned has had a failure.

    It's being replaced. I can't believe all NAD products have these issues (my NAD is a T955) but my little hunk of 'bullet-proof' archetecture has really disappointed - and cost over $1500 in repairs (NAD paid for the 1st).

    I enjoyed the NAD and felt it did what it was asked to do but enough is enough.
    Marantz AV7005
    Marantz MM7055
    Onkyo DX-755 CdP
    Oppo BDP-93
    Technics SL-1301/Shure M97xE
    Polk RTi A7s
    Polk CSi A6
    Polk FXi A6s
    Velodyne VDR10-BV
    Panamax M5100-PM
    Antec VERIS A/V Cooler x 2

  8. #8

    Member Sales Rating: (0)

    Join Date
    Sep 2011
    Location
    Cleveland
    Posts
    6,114

    Default

    That sucks. Did you try contacting NAD again about repeat problems ?

  9. #9

    Member Sales Rating: (0)

    Join Date
    Oct 2012
    Location
    Cinci,Ohio
    Posts
    992

    Default

    Speaks close to a external power source?

  10. #10

    Member Sales Rating: (0)

    Join Date
    Oct 2010
    Location
    It's not home, the N.W. will do for now
    Posts
    1,435

    Default

    Sorry to hear about your amp, not to mention the hefty repair cost, ouch! I've decided to catch a buzz myself!
    Draggn' knee is exhilarating, 150mph wheel standers are pretty cool too


    Home Theater-7.2
    Display-SamsungPN64D8000 | Receiver-Onkyo TX-NR807 | Source-OPPOBDP-103 | Amplifiers-Emotiva; XPA-2 x2, XPA-3 | Speakers: PolkAudio; mains-RTiA9, rears-RTiA9, center-CSiA6, surrounds-FXiA6 | Sub-Epik Empire x 2 | Interconnects-Emotiva


    Cans
    Grado RS2i

    2 Ch Rig
    First purchase will be; a pair of ? but I'd love a pair of SDA SRS

  11. #11

    Member Sales Rating: (10)

    Join Date
    Jan 2003
    Location
    WA State
    Posts
    3,282

    Default

    [QUOTE=Geoff4rfc;1856305}I've decided to catch a buzz myself![/QUOTE]

    Beat you there brother...

  12. #12

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Location
    Tampa Bay
    Posts
    313

    Default

    chumlie -

    My wife also suggested I contact their US rep and tell him about these issues and agree you both are giving good advice. Will call after holidays.
    Marantz AV7005
    Marantz MM7055
    Onkyo DX-755 CdP
    Oppo BDP-93
    Technics SL-1301/Shure M97xE
    Polk RTi A7s
    Polk CSi A6
    Polk FXi A6s
    Velodyne VDR10-BV
    Panamax M5100-PM
    Antec VERIS A/V Cooler x 2

  13. #13

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Location
    Tampa Bay
    Posts
    313

    Default

    Msabot1 -

    Don't think that's a problem.. The amp that went this time was powering a rear surround. The first to go was powering the right front ... at least 6 ft from the Panamax.

    I 'grilled' the tech at Pro Audio (warranty shop in Tampa) as to what I could have done to cause these problems and he couldn't see that anything was wrong in the system or its setup.

    I used Antec coolers on top of both the NAD and Onkyo. When this happened last year I took temperatures (via infrared) from the tops of both and forwarded that info to the respective companies. Both said I was within recommended operating temps.
    Marantz AV7005
    Marantz MM7055
    Onkyo DX-755 CdP
    Oppo BDP-93
    Technics SL-1301/Shure M97xE
    Polk RTi A7s
    Polk CSi A6
    Polk FXi A6s
    Velodyne VDR10-BV
    Panamax M5100-PM
    Antec VERIS A/V Cooler x 2

  14. #14

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Location
    Tampa Bay
    Posts
    313

    Default

    Some good news! Following my wife's (and chumlie's) good advice, I found my way to an engineer/customer service type guy at NAD (Lenbrook America) and went over the issues I've had with this amp, the T955. Like everyone else, he was surprised that I have had problems and cited the old 'bullet proof' refrain.

    After a short chat he put me on hold and returned with a very livable solution: Even though the unit is 5 months out of warranty, they will share the repair costs with me, my part being the shop labor.

    I (and the shop) received via email a warranty authorization memo and I'll be taking the T955 over to Tampa in the morning to be repaired.

    Have to say that's about as fair as anyone could ask for.

    Thank you, NAD.
    Marantz AV7005
    Marantz MM7055
    Onkyo DX-755 CdP
    Oppo BDP-93
    Technics SL-1301/Shure M97xE
    Polk RTi A7s
    Polk CSi A6
    Polk FXi A6s
    Velodyne VDR10-BV
    Panamax M5100-PM
    Antec VERIS A/V Cooler x 2

  15. #15

    Member Sales Rating: (0)

    Join Date
    Dec 2010
    Posts
    106

    Default

    Quote Originally Posted by Speedskater View Post
    Standard trouble shooting procedure is to start as simple as possible and add components one at a time.

    a] Disconnect all the interconnects and power cords.
    b] Connect the amps power cord and speaker wires.
    c] Use a battery powered music source into the amp. Does it hum?
    Use a single AC power outlet strip when plugging in more components.
    d] Connect your controller's power and the interconnects to the amp. Use a battery powered music source into the controller. Does it hum?
    e] Continue adding components one at a time until it starts to hum.
    nice post, thanks

  16. #16

    Member Sales Rating: (0)

    Join Date
    Dec 2012
    Location
    England
    Posts
    10

    Default

    thanks for sharing this post here it is much helpful for the new users on this forum......
    .

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Similar Threads

  1. ANyone catching the american music awards?
    By dudeinaroom in forum The Clubhouse
    Replies: 13
    Last Post: 11-23-2009, 04:03 PM
  2. Replies: 3
    Last Post: 04-27-2007, 02:41 AM
  3. Hum & Buzz
    By dholmes in forum Electronics
    Replies: 28
    Last Post: 11-13-2006, 03:34 PM
  4. Catching Snow Flakes
    By F1nut in forum The Clubhouse
    Replies: 1
    Last Post: 12-23-2004, 05:22 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts