HK AVR510 ground loop humming

ViperZ
ViperZ Posts: 2,046
edited March 2008 in Troubleshooting
Hi all,

I know this has been discussed before, but I tried all previous suggestions, and nada...

Hooked up Harman Kardon AVR510 in place of my DA333ES, and getting 60Hz low-volume hum from my channels (well, from center and surrounds, since I am driving mains with a separate amp).

I tried disconnecting inputs one at a time - no difference. Disconnected coax cable from cable box - no difference too :(.

HK has a 2-prong plug. I am using cheaper Dynex surge suppressor (http://www.bestbuy.ca/catalog/proddetail.asp?logon=&langid=EN&sku_id=0926INGFS10060269&catid=20195), but no power conditioner.

Sony also has a 2-prong plug (although, much thicker power cable), and it never hummed.

I did try plugging the unit into separate power outlet (although that outlet is within 3-4 feet of the main one, so they may be (and probably are) on the same line) - no change.

Suggestions?
Panasonic PT-AE4000U projector for movies
Carada 106" Precision Series (Classic Cinema White)
Denon AVR-X3600H pre/pro
Outlaw 770 7-channel amplifier
B&W CDM1-SE fronts
B&W CDM-CNT center
B&W CDM1 rears on MoPADs
JBL SP8CII in-ceiling height speakers
Samsung DTB-H260F OTA HDTV tuner
DUAL NHT SubTwo subwoofers
Oppo BDP-93 Blu-Ray player
Belkin PF60 Power Center
Harmony 1100 RF remote with RF extender
Sony XBR-X950G 55" 4K HDR Smart TV + PS3 in the living room
Post edited by ViperZ on
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Comments

  • tonyb
    tonyb Posts: 32,963
    edited March 2008
    Disconnect everything from the receiver but the speakers.Unplug the amp section to the 1000p's. Reconnect things one cable at a time to see if a cable might be causing it.Last,plug in the amps on the 1000p's.Find it odd you don't have a 3 prong power cord.You can get a cheap adapter at your local hardware store.Is this a dedicated line? Anything else on that line that draws alot of power?
    HT SYSTEM-
    Sony 850c 4k
    Pioneer elite vhx 21
    Sony 4k BRP
    SVS SB-2000
    Polk Sig. 20's
    Polk FX500 surrounds

    Cables-
    Acoustic zen Satori speaker cables
    Acoustic zen Matrix 2 IC's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable

    Kitchen

    Sonos zp90
    Grant Fidelity tube dac
    B&k 1420
    lsi 9's
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  • BottomFeeder
    BottomFeeder Posts: 1,684
    edited March 2008
    With the help of the good folks here, I just fixed a low level hum on my Adcom GFA 5500 by connecting the two negative speaker posts on the amp w/a strip of speaker wire. No kidding.

    And it worked.

    Check out this thread for much more & good luck!:
    http://www.polkaudio.com/forums/showthread.php?t=63405&highlight=Adcom+hum%3F
    "Wish I didn't know now what I didn't know then." Bob Seger
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