hum

leroyjr1
leroyjr1 Posts: 8,785
edited September 2008 in Basic Hookup/Wiring Questions
Is a slight hum normal when using IC's. I am using signalII and notice a slight hum when I put my ear up to the speakers.
Post edited by leroyjr1 on
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  • TouchOfEvil
    TouchOfEvil Posts: 967
    edited September 2008
    No hum on my setup. I had a hum when veiwing television but it was the IC's. Changed em out and byebye hum.
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited September 2008
    The IC's just arrived brand new from signal. Its not loud I have to put my ear directly onto the woofer to hear it 3 inches away it gone. Is that not a big deal or should I try to fix it.( different cables)

    Any one else using Signal II noticed any hum?

    Thanks
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited September 2008
    Anyone else running signal ic's?
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  • Erik Tracy
    Erik Tracy Posts: 4,673
    edited September 2008
    leroyjr1 wrote: »
    Is a slight hum normal when using IC's. I am using signalII and notice a slight hum when I put my ear up to the speakers.


    You're picking up the sub-atomic magnetic interference being generated by the new Supercollider. :D

    That you are picking this up as hum is a sure indicator that you have selected high quality ICs.

    If you hook both ends of your ICs to an earth ground for 120 hours, then any latent sub-atomic magnetic interference should be dissipated.

    Be sure to wrap them in tin foil during your burn-in to further shield them from more Supercollider radiation.... :p

    H9: If you don't trust what you are hearing, then maybe you need to be less invested in a hobby which all the pleasure comes from listening to music.
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  • olilugo
    olilugo Posts: 405
    edited September 2008
    I use signal IC II! no hum here. dead silent.
    Current HT setup
    Mains: B&W 804s
    Center: Polk CSi5
    Surround: Polk FXi3
    Sub: Velodyne DLS-3750R
    Receiver: Pioneer SC-07
    Amplifier: Sunfire TGA5200
    TV: Sony KDS60A2020
    DBP: Sony DBP-S350
    CDP: Pioneer DV-48AV
    Interconnect cables: SignalCable analog II
    speaker cables: SignalCable Ultra Speaker Cables Bi-wire
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  • mmadden28
    mmadden28 Posts: 4,283
    edited September 2008
    Haven't had this issue yet (outside of a known source), but perhaps you have a Ground Loop issue. Search in this forum and I'm sure you'll find lots of suggestions for troubleshooting and resolving if it is indeed your issue.

    Good Luck
    ____________________
    This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects.

    HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited September 2008
    I'm just going to leave it. Strange that you can move the IC's and it gets lower and louder. The way it is now I have to put my ear directly on the woofer to here it , and it doesn't increase when I turn the volume up. But i still know it's there.

    MMADDEN28

    Does you ONKYO 805 make any processing noise.
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  • mmadden28
    mmadden28 Posts: 4,283
    edited September 2008
    Well, apparently I do have a hum, although very slight. It does not change with any volume changes either. I can't hear it unless I am right on top of the speaker. In the RTi12's I hear it in the mid section-nothing in the woofers, and a littel higher freq stuff in the tweeters. It's most evident on the CsiA6.
    I suppose its possible I may have heard it before but dismissed it as the "noise floor". My seating is at least 14' away. The Cable box DVR is actually louder-so it hasn't caused me any concern-although now that you brought it to my attention, damn you-I'm sure it will eat away at me. :mad:;)

    Anyway, I disconnected the IC from the input to the amp and the noise is gone. The output from the amp is absolutely dead quiet-so its not the amp causing it. It must be the Onk. Actually if I listen real close to the Onk I can hear its xformer hummimg-so its likely the cause (at least in my setup). Of course I am sure I have some AC wires crossing some of my ICs in the mix at several points due to the tight space its in. The next time I have all my gear out, I'll listen again to be sure its not AC interference.
    I'd hook up the pre from my 2ch setup, but its already a known source of hum so it wouldn't be a good test. I'll see if I can find another source to connect to the amp in my HT rig to see if I still hear a hum.

    FYI, my amp is plugged directly into the wall, and the rest of the equipment is connected to the PF60, the PF60 is then plugged into the same outlet as the amp (I'll be upgrading to some dedicated 20A outlets in the coming weeks).
    ____________________
    This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects.

    HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
    2-chnl : Pio DV-46AV (SACD), Dodd ELP, Emotiva XPA-1s, XPA-2, Odyssey Khartago, LSi9, SDA-SRS 2 :cool:, SB Duet, MSB & Monarchy DACs, Yamaha PX3 TT, SAE Tuner...
    Pool: Atrium 60's/45's
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited September 2008
    try hooking a speaker up to your onkyo via speaker output terminals and see if you get a hum
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  • mmadden28
    mmadden28 Posts: 4,283
    edited September 2008
    Can't do it right now-to tight-Next time I have it out I will.
    ____________________
    This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects.

    HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
    2-chnl : Pio DV-46AV (SACD), Dodd ELP, Emotiva XPA-1s, XPA-2, Odyssey Khartago, LSi9, SDA-SRS 2 :cool:, SB Duet, MSB & Monarchy DACs, Yamaha PX3 TT, SAE Tuner...
    Pool: Atrium 60's/45's
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited September 2008
    mmadden28 wrote: »
    the cable box dvr is actually louder-so it hasn't caused me any concern-although now that you brought it to my attention, damn you-i'm sure it will eat away at me. :mad:;)

    hum huumm huuummm huuuummmm LOL
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  • steveinaz
    steveinaz Posts: 19,538
    edited September 2008
    You either have a ground loop, bad IC, or a near-by "noise-maker" inducing hum on that IC. Since moving the IC changes it's level, you could also have a loose jack on the back of your equipment...

    Does a different IC remove the hum?
    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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  • doctorcilantro
    doctorcilantro Posts: 2,028
    edited September 2008
    steveinaz wrote: »

    Does a different IC remove the hum?

    That's what I was wondering.

    If your Onkyo is not a "3 prong" grounded device, you could try to reverse the AC polarity by flipping the plug around; my Sunfire pre allows me to do this because the plug is not made to fit only one way (e.g. like most a lamp).

    Do you hear it on different sources via the Onkyo? Or have you moved one source to another input? What's the signal chain like?

    DC (hi all...first post!)
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    Decware EL34 amp
    Allnic H-1201 phono
    Zu Union Cubes
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited September 2008
    No, changing IC's don't removed the hum. I think it has something to do with my Onkyo.Because when disconnect the ic's from the amp the hum is gone and when I hooked up the speaker via speaker wire terminal I still heard a slight hum. I am going to just leave it at the time because the room has to be dead silent and my ear has to be pressed up against the woofer in order for me to hear it. When I get some time I am going to send my Onkyo into Circuit City to get looked at. Thats what I bought the three year warranty for.
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  • mmadden28
    mmadden28 Posts: 4,283
    edited September 2008
    doctorcilantro wrote: »
    That's what I was wondering.

    If your Onkyo is not a "3 prong" grounded device, you could try to reverse the AC polarity by flipping the plug around; my Sunfire pre allows me to do this because the plug is not made to fit only one way (e.g. like most a lamp).

    Do you hear it on different sources via the Onkyo? Or have you moved one source to another input? What's the signal chain like?

    DC (hi all...first post!)

    Welcome to Club Polk Doc. Are you a chef/cook?
    ____________________
    This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects.

    HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
    2-chnl : Pio DV-46AV (SACD), Dodd ELP, Emotiva XPA-1s, XPA-2, Odyssey Khartago, LSi9, SDA-SRS 2 :cool:, SB Duet, MSB & Monarchy DACs, Yamaha PX3 TT, SAE Tuner...
    Pool: Atrium 60's/45's
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  • doctorcilantro
    doctorcilantro Posts: 2,028
    edited September 2008
    Yes, I do love to cook but not for a trade. Actually, as a father and grad. student I rarely have time. Lately, we've found a store which allows you to prep really good meals and freeze them for quick cook times. We're eating like kings lately and we both work! It's a great idea; I recommend it to any busy parent or professional.
    For Sale 2019:
    Tortuga Audio LDR passive preamp
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    Allnic H-1201 phono
    Zu Union Cubes
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  • xandra
    xandra Posts: 291
    edited September 2008
    I had same problem (slight hiss from speakers) . till I got ground loop isolator. I've since also changed outlet to dedicated circuit. Now All is quiet on the eastern front.

    In my case, noise appeared as soon as I added an Amp, and was caused by cable tv: Very easy to test... just unhook RF cable at point where it comes in wall.
    LR Setup:
    Polk RTi10's, RTi6's, CSiA6 (5 ch setup)
    Onkyo 705 & Denon 3808ci Receiver, Onk 875
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  • steveinaz
    steveinaz Posts: 19,538
    edited September 2008
    Yes, sometimes cable feeds that are grounded at a different potential (usually) can introduce some bad hum.
    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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