Thanks Thanks:  0
Likes Likes:  0
Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Results 1 to 3 of 3

Thread: sub help please

  1. 12th January 2010, 05:15 PM #1
    Timbre Surfer
    Timbre Surfer is offline Member
    Join Date
    Feb 2007
    Location
    Bundy
    Posts
    65

    Default sub help please

    G'day

    I have a harmon Kardon AVR130 powering a set of Warfdale diamond 8.1 towers, centre and Yamaha inceiling surrounds. It also powers a Harmon Kardon sub.

    About a year ago the sub started making a fast paced "d-d-d-d-d" (like a big helicopter was over the front room) when left in standbye mode. It still does it and i have to manually turn it on when i want to use it, after 5 minutes of no signal it is meant to put itself into standbye but instead does that "d-d-d" noise. so in some quiet movie scenes the sub spoils it due to no signal. Just lately it has started holding a single note and carrying it after a sustained bass heavy section of either movie or song.

    what could this be? I think the sub and the amp are 5 years old.

    apart from that it is great, when i get a good movie out the neighbours tell me the thunder has come home, hehe.
    I forgot what i was taught, I only remember what I have learnt
    Reply With Quote Reply With Quote
  2. 12th January 2010 05:15 PM # ADS
    Google Adsense Advertisement
    Join Date
    Always
    Location
    Advertising world
    Posts
    Many





     
  3. 20th January 2010, 11:56 AM #2
    soundman's Avatar
    soundman
    soundman is offline GOLD MEMBER
    Join Date
    Apr 2002
    Location
    Brisbane
    Posts
    5,773

    Default

    I'd almost bet my left nut that one or more of the caps has gone out of spec or leaky.
    Or maybe one of the semi's has gone out of spec.

    No simple solution...needs proper diagnosis and repair.

    cheers
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.
    Reply With Quote Reply With Quote
  4. 14th March 2010, 11:41 AM #3
    acropolite
    acropolite is offline New Member
    Join Date
    Oct 2005
    Location
    Launceston Tasmania
    Posts
    5

    Default

    I'd almost bet my left nut that one or more of the caps has gone out of spec or leaky
    I'd have to agree. Often when caps go they bulge at the top, or show visible signs of leakage, the problem you're describing, used to be called motorboating and is usually caused by faulty caps. It would be worth opening the beast, if you have any technical ability, and replacing any suspect caps (if there aren't too many replace the lot). If you do replace any, look for a place like Farnell where you can buy capacitors specifically made for long life, the average Duck Smuth etc cap has a rated life of just a couple of thousand hours.
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Tags for this Thread

Posting Permissions

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

Forum Rules