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  1. #1

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    Default I'm losing my mind...

    I have the dreaded speaker pump subsonic craziness going on....Its only on the left speaker, speakers are same distance from TT (about 3 feet) I have the project tube box s phono pre that is supposed to have a built in subsonic filter...no switch, on all the time...the cart is set up from factory on this TT (maybe wrong...?) when I use the low filter on my Maantz 1060 it seems to go away but the music suffers...

    I'm using Blue Jeans IC's could this be making it worse...?

    not sure why only 1 speaker, the right is fine and its closer to the arm...

    I thought maybe speaker was out of phase but if that was the case using filter on amp wouldn't change it...

    its not a warped record issue because i use a clamp...

    At the moment I'm having a miller light and sitting in silence trying to figure this out...
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  2. #2

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    If it's only in one channel makes me think its LF oscillation in the amplifier...

    Otherwise, the most likely culprit is acoustic feedback - a good test for acoustic feedback. With the platter not turning, amp on and set to phono and at zero volume, set the stylus down in the groove of a record and slowly increase the volume. If, as the volume increases, the woofer(s) start to boogie and/or you hear the low-frequency howl; bingo!

    If your're actually playing a record and the problem goes away at lower volume levels, that would also be symptomatic of acoustic ffeedback.

    Acoustic feedback is usually due to poor isolation of the tt from vibration and/or ill-advised matching of cartridge and arm (e.g., high-compliance cartridge in an arm with medium to high effective mass, or low-compliance cartridge in low-mass arm).
    all the best,
    mrh

  3. #3

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    gonna try that test thanks...
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  4. #4

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    gonna try that test thanks...

    if it is feedback I'm not sure what to do....there is no vibration in the base and the cart and arm are put together at the factory...

    sorry posted before completed....

    see, I'm going crazy...
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  5. #5

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    I'm thinking "airborn" vibration/harmonics.

    Transport: Oppo BDP-103/USB HDD (flac)
    DAC/Preamp: Benchmark DAC/PRE
    Power Amp: Parasound HCA-1500A
    Speakers: Harbeth Compact 7ES-3 Monitor
    Cables: Kimber Hero/8TC; DH Labs D-75

  6. #6

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    Default

    Stupid question, but does your TT have a dust cover? Mine was exhibiting similar symptoms (the subsonic was in both channels but significantly worse on the left than the right) and it turned out the cause was from playing with the dust cover shut...
    Just spitballin' here.
    "Unwad those panties and have a good time man. We're all here to help each other, no matter how it might appear." DSkip
    I may have an addiction... RTA-15TL, SDA 2, LSi25, LSi15, LSi9, LSi7, LSiCx2, LSiFX, LS/FX, RT/FX, DSW MP2000...and that's just the Polks...

  7. #7

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    Quote Originally Posted by ZLTFUL View Post
    Stupid question, but does your TT have a dust cover? Mine was exhibiting similar symptoms (the subsonic was in both channels but significantly worse on the left than the right) and it turned out the cause was from playing with the dust cover shut...
    Just spitballin' here.
    Good call, never a good idea to play a TT with the cover closed.

    Transport: Oppo BDP-103/USB HDD (flac)
    DAC/Preamp: Benchmark DAC/PRE
    Power Amp: Parasound HCA-1500A
    Speakers: Harbeth Compact 7ES-3 Monitor
    Cables: Kimber Hero/8TC; DH Labs D-75

  8. #8

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    i either raise it all the way or completely take it off when listening...
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  9. #9

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    Quote Originally Posted by steveinaz View Post
    I'm thinking "airborn" vibration/harmonics.
    to the left speaker only...?
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  10. #10

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    Sure, ever move around your room and hear bass peaks in different locations?

    Transport: Oppo BDP-103/USB HDD (flac)
    DAC/Preamp: Benchmark DAC/PRE
    Power Amp: Parasound HCA-1500A
    Speakers: Harbeth Compact 7ES-3 Monitor
    Cables: Kimber Hero/8TC; DH Labs D-75

  11. #11

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    did the test and same result...left speaker drivers going crazy....there is supposed to be a subsonic filter in the tube box s phono pre, so I'm even more confused....its on a sturdy platform with stone under the TT....using Bluejeans IC's, Herbies matt, record clamp....etc...speakers are 3 feet away....they were closer with my old table and never had this issue
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  12. #12

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    its not the amp...just hooked up an iPod and everything is normal...
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  13. #13

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    Brent

    have you re-tried your NAD Phono stage? just reaching here since you have cover almost all the bases for what people here & on other forums have suggested to do based on your problem.

  14. #14

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    Sorbothane feet under TT will stop most all vibration from making it to the table.

    One of the reasons I gave up the TT just too finicky for me.

  15. #15

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    Quote Originally Posted by voltz View Post
    Brent

    have you re-tried your NAD Phono stage? just reaching here since you have cover almost all the bases for what people here & on other forums have suggested to do based on your problem.
    could it be a bad tube in the phono pre...?
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  16. #16

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    I bought the TT online from a store called ListenUp...

    Awesome people, sent me out a replacement today...
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  17. #17

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    I remember you have to adjust the TT from the start, fingers crossed the new one cures you problems.

  18. #18

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    Default

    If it doesn't I might make the news....

    Man freaks out and throws records all around neighborhood...
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  19. #19

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    Quote Originally Posted by BKphoto View Post
    If it doesn't I might make the news....

    Man freaks out and throws records all around neighborhood...
    Wow, I just had a flash-back from an old Bond Movie, Goldfinger
    Home Theater/2 Channel:
    Front: SDA-2ATL http://www.polkaudio.com/forums/show...ished...Almost
    Center: Custom http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat, H-Nuts, BH5
    Pioneer Elite VSX-72TXV, Carver PM-350, SVS PB2-Plus Subwoofer


    www.dhsspeakerservice.com

  20. #20

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    Ha...

    good one...
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  21. #21

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    Quote Originally Posted by steveinaz View Post
    Good call, never a good idea to play a TT with the cover closed.
    Don't want to derail the thread but why is this?

  22. #22

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    Quote Originally Posted by audiocr381ve View Post
    Don't want to derail the thread but why is this?
    It picks up vibrations and feeds it to the tone arm..
    No Way But The Hard Way, So Get Used To It!!!

  23. #23

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    Quote Originally Posted by Toolfan66 View Post
    It picks up vibrations and feeds it to the tone arm..
    'zackly so - although, in fairness, there are two schools of thought on this :-)

    That said, up here in the Northeast - in the winter time - there's another, compelling reason not to play with the cover down... when the relative humidity is low, the static field that can build up can quite literally lift the arm up off the record when an album is playing! In fact, it's fun to gently rub one's fingertips across a closed dust cover (in Northern New England, in January) when a record is being played, and watch the arm [i]gently levitate[\i]... better'n David Copperfield...

    FWIW, I've actually taken to the simple step of just sitting the acrylic dustcover atop my ol' dump-find Technics -- and I just remove it completely when spinning a licorice pizza.

    DSC_8946 by mhardy6647, on Flickr
    all the best,
    mrh

  24. #24

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    new TT same problem....although this table had no vibration problem and is completely quiet its still freaking out my speakers....used the Pre in my amp instead no difference...looks like i'll get a http://www.ebay.com/itm/390858460436...%3AMEBIDX%3AIT
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  25. #25

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    Dang :( let us know if it does the trick.

    I think they are who I got my stainless record clamp from.

  26. #26

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    Can the table be placed somewhere else in the room? It may be sitting in a space where there is a big bass peak. Someone else eluded to this but didn't actually say it. Even as a test it would be worthwhile changing its location.
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D

  27. #27

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    I'd try some pangea sorbothane feet first before i went to 100.00+ route. I have used them for years from audioquest but these are cheaper. Here's a link that you can get sheets from might be cheaper don't know.

    http://forums.audioreview.com/audio-...eet-38200.html

  28. #28

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    ^^^^^^

    I do have some under my TT that I got from Audio Advisor, after pitdogg2 talked about them earlier in this thread and with the problems you been having I thought they would be a good idea to pick some up, & I picked up the smaller ones for my sources.

    http://www.audioadvisor.com/Pangea-A.../#.U7MMvLEd2Ys

  29. #29

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    Ok, I got a few things to try. Whenever I had woofer pump issues with my turntables in the past it was nearly always due to the turntable not being level. If your left side of the table is low the momentum of the table while spinning will make the left speaker pump. I would check the level on the table first. But a level on top of your clamp directly over the spindle. The next thing is what kind of stone platform do you have it sitting on? Believe it or not most stone bases,especially granite ring like a bell. If you are going with stone, limestone is your best bet. Wood bases work good, but they need to be at least 2inches thick if going with maple, 3 inches thick is even better. Like the others have mentioned experiment with sorbathane half-domes under the table, or under the platform, or both and see what works best. Herbies tenderfeet or isoballs are actually much better, but the prices for those can add up quick compared to sorbathane. I've experimented with many different footers with my table and isolation platform and found what works the best is the stock feet of the table being under laid by a 3" thick maple platform with wood footers between the platform and rack. Ymmv. If after trying all this you still have issues, I would look at either changing the location of your table or move your speakers further from the table like the others have mentioned.

    Btw, just because you are using a clamp, doesn't mean your vinyl is completely level. I use a TTWeights heavy 3.5lb center weight combined with an outer weight that ways over 2 lbs and even this setup will not completely flatten all records. Ive tried clamps also with worse results than the weights with moderate to badly warped records. My gut feeling what you are dealing with is an unlevel table based on my experience with the same issue in the past. It nearly drove me crazy also.
    Last edited by Dawgfish; 07-01-2014 at 06:38 PM.

  30. #30

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    indeed - granite is awful for turntable bases/plinths - soapstone's an option.
    all the best,
    mrh

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