Humming sound...Not sure what could be causing it!

rnp614
rnp614 Posts: 598
edited July 2005 in Electronics
All of a sudden my RTi38s hum like crazy. What should I look for as a cause? I'm running a Rotel RSP-980 pre and a Carver AV505 amp. I am not sure what has changed to create this hum, but as far as I know the only thing that is different is we have a digital cable box underneat the rotel.
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  • beardog03
    beardog03 Posts: 5,550
    edited July 2005
    ground loop ?
    bad ground somewhere ?
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  • F1nut
    F1nut Posts: 50,778
    edited July 2005
    It's your cable box.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • 2+2
    2+2 Posts: 546
    edited July 2005
    never mind.....
    System 1: Martin Logan Vantage, Rotel RC 1070, B&K Reference 200.2, Music Hall DAC 15.2, Yamaha 2300

    System 2: LSi15 w/db840, Marantz SR8400, Rotel 1080, RM6800 (C&S), Sony X2020ES

    System 3: LSi7, Yamaha SW215, Music Hall Maven, Music Hall MMF CD25 w/627opamps

    System 4: RTi100, Harman Kardon AVR 230, Panasonic DVD
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  • aaharvel
    aaharvel Posts: 4,489
    edited July 2005
    could be O'Reilly's vibrator... ;)
    H/K Signature 2.1+235
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    "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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  • rnp614
    rnp614 Posts: 598
    edited July 2005
    Originally posted by beardog03
    ground loop ?
    bad ground somewhere ?

    What do you mean?
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  • rnp614
    rnp614 Posts: 598
    edited July 2005
    Originally posted by F1nut
    It's your cable box.

    You really think so? If I unplug it should the noise go away then? I'll have to check and see
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  • F1nut
    F1nut Posts: 50,778
    edited July 2005
    Disconnect the damn thing entirely. See if it doesn't go away.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • Airplay355
    Airplay355 Posts: 4,298
    edited July 2005
    I had a hum and it was my TV not my cable box. Any time (through video connection or audio connection) the TV was in some way shape or form connected to my carver amp, i get a hum from my speakers. I think I need a power conditioner :(

    It never happened with my marantz receiver though, so I don't really know what it is. Maybe the carver amp or AMC pre is just more sensitive to **** power.

    Let me know if you ever solve this, because maybe we have the same problem.
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  • dkg999
    dkg999 Posts: 5,647
    edited July 2005
    Try disconnecting the cable line to the cable box. I never had a ground loop hum from my cable line until Insight installed my digital HD cable box. I just ran my cable line through a Tripp Lite power strip that has the cable surge protection. Problem solved.
    DKG999
    HT System: LSi9, LSiCx2, LSiFX, LSi7, SVS 20-39 PC+, B&K 507.s2 AVR, B&K Ref 125.2, Tripplite LCR-2400, Cambridge 650BD, Signal Cable PC/SC, BJC IC, Samsung 55" LED

    Music System: Magnepan 1.6QR, SVS SB12+, ARC pre, Parasound HCA1500 vertically bi-amped, Jolida CDP, Pro-Ject RM5.1SE TT, Pro-Ject TubeBox SE phono pre, SBT, PS Audio DLIII DAC
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  • rnp614
    rnp614 Posts: 598
    edited July 2005
    Ok, I foudn that the hum was caused by the cable coming out of the cable box going to the tv. If I disconnect the cable coming out of the cable box the humming goes away. If I even touch the cable back there the humming starts up again.


    Will a surge protector that has the cable thing on it work?
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  • rnp614
    rnp614 Posts: 598
    edited July 2005
    Can anyone link me to something that would work?
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  • steveinaz
    steveinaz Posts: 19,538
    edited July 2005
    Buy the Mondial Magic ($99) connect it outside to your incoming main cable wire, and your whole house will be hum free on the coax connections. That's what I do.
    Source: Bluesound Node 2i - Preamp/DAC: Benchmark DAC2 DX - Amp: Parasound Halo A21 - Speakers: MartinLogan Motion 60XTi - Shop Rig: Yamaha A-S501 Integrated - Shop Spkrs: Elac Debut 2.0 B5.2
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  • unc2701
    unc2701 Posts: 3,587
    edited July 2005
    sometimes... but what you really need is a coax ground loop isolator. search on ebay...


    here's one:
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5790008221&category=48637&ssPageName=WDVW&rd=1
    Gallo Ref 3.1 : Bryston 4b SST : Musical fidelity CD Pre : VPI HW-19
    Gallo Ref AV, Frankengallo Ref 3, LC60i : Bryston 9b SST : Meridian 565
    Jordan JX92s : MF X-T100 : Xray v8
    Backburner:Krell KAV-300i
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  • rnp614
    rnp614 Posts: 598
    edited July 2005
    Originally posted by steveinaz
    Buy the Mondial Magic ($99) connect it outside to your incoming main cable wire, and your whole house will be hum free on the coax connections. That's what I do.

    I'd like to spend as little as possible...I'm a bit low on cash right now.
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  • rnp614
    rnp614 Posts: 598
    edited July 2005
    Originally posted by unc2701
    sometimes... but what you really need is a coax ground loop isolator. search on ebay...


    here's one:
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5790008221&category=48637&ssPageName=WDVW&rd=1

    What do you do with the ground outlet on that Mondial Magic? What do you hook up to it and where do you put it?
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  • rnp614
    rnp614 Posts: 598
    edited July 2005
    Originally posted by unc2701
    sometimes... but what you really need is a coax ground loop isolator. search on ebay...


    here's one:
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5790008221&category=48637&ssPageName=WDVW&rd=1

    Looks like thats what I'm going to buy! Thanks for the tip!
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  • steveinaz
    steveinaz Posts: 19,538
    edited July 2005
    The Modial Magic IS a ground loop isolator---a VERY good one.

    I don't use the grnd connection on mine, I just hook the main cable from the street to input, and a short RG-6 from output to the house splitter...

    I can turn my system all the way up----no hum, no noise. This item is a "MUST HAVE" for anyone interfacing their audio system with their video. To me, its another needed component. I've lived in 4 different houses over the last 5 years, and all of them had hum on the cable.
    Source: Bluesound Node 2i - Preamp/DAC: Benchmark DAC2 DX - Amp: Parasound Halo A21 - Speakers: MartinLogan Motion 60XTi - Shop Rig: Yamaha A-S501 Integrated - Shop Spkrs: Elac Debut 2.0 B5.2
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  • unc2701
    unc2701 Posts: 3,587
    edited July 2005
    mondial magic on ebay:

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5790714305&category=39803&ssPageName=WDVW&rd=1

    You only have to hook up the ground strap if you want it to function as a surge suppressor.
    Gallo Ref 3.1 : Bryston 4b SST : Musical fidelity CD Pre : VPI HW-19
    Gallo Ref AV, Frankengallo Ref 3, LC60i : Bryston 9b SST : Meridian 565
    Jordan JX92s : MF X-T100 : Xray v8
    Backburner:Krell KAV-300i
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  • gazix
    gazix Posts: 10
    edited July 2005
    Any thoughts on if it isn't a ground loop problem?

    All the tv's in the house when they are on(incl mine plugged into the line-r), subwoofer aslo plugged into the line-r (always on), and the internet router plugged into wall jack buzz/hum all the time.

    This is the voltage line regulator I am using.

    http://www.apc.com/resource/include/techspec_index.cfm?base_sku=LR1250I

    Tried disconecting the coax cable line from the source and the devices are still buzzing.
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