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  1. #1

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    Default Tweeter hiss: lsi15 = hiss, lsi9 = no hiss

    when theres no audio input and avr/amp is idling, the lsi15 hisses - not bad, audible when ear is 2 - 3" away from tweeter. on the lsi9, its completely quiet....

    the hiss does not increase when the when the volume on the avr is turned up w/o audio input.

    what is causing the 15 to hiss and not the 9?
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  2. #2

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    The hiss is coming from your receiver.

  3. #3

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    if there is no signal, the main amps of your reciever are on, but the surround ones are off. something to that extent. definitly not the speaker, as there is no way for a speaker to hiss without it coming from an amp section (or at least that I know of)

    I've seen recievers hiss (havign to put ear up to it to hear it. seems kind of normal to me. if it gets to loud it might become an issue though
    Theater - Polk LSi15, LSiC, LSi9 speaks, DIY Sub (142.5L box, SVS plus driver, 500 Watt plate amp)...Outlaw 990 pre/pro, Carver TFM45, 2 X Outlaw M200 . Rotel RB980 . PS3, Monster 3600 power center

    2 Channel -
    Anthem Pre 2l, Jolida JD100 CD player, CAL Sigma DAC, Carver m4.0, Polk LSi9 w external modified Crossovers (thanks Trey!)

  4. #4

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    What the others have said. It's the power being supplied by the receiver to the amps since the receiver is on.

    Now if you had an increase of the hiss or a hum then you would have the dreaded ground loop syndrome & that's a pain in the butt!
    Sunfire TGP III PrePro, Sunfire Cinema Grand Signature 405wpc 5 ch. Amp, Rotel RCD-1072 CDP, Onkyo TA2600 Tape Deck, Pioneer Elite 47-A DVD, Sony 32" XBR TV, Polk RTA-8T Main Speakers, Boston VR-920 Center Channel, Boston PV-600 Subwoofer, Polk DSW 400 Subwoofer, Polk FXi-3 Surround Speakers

  5. #5

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    Quote Originally Posted by mightymouse View Post
    The hiss is coming from your receiver.
    but why does it happen on the 15s and not the 9s? the 9 is dead silent...
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  6. #6

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    Could be a bad cable in the mix too or static from your carpet.Wool carpets are notorious for it.

  7. #7

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    Quote Originally Posted by SlowcarIX View Post
    but why does it happen on the 15s and not the 9s? the 9 is dead silent...
    So you're saying that you power down the system, swap the front 15's with 9's, power it all back up and it's dead silent. Put the 15's back on the front and there's hiss?

    Or do you have the 9's and the 15's hooked up at the same time?
    Speakers: Polk LSi15
    Pre: Adcom GFP-750 with HT Bypass
    Amp: Pass Labs X-150
    CD/DVD Player: Classe CDP-10
    Interconnects: MIT Shortgun S3 Pro XLR
    Speaker cables: MIT MH-750 bi-wire
    TT:Micro Seiki DD-35
    Cartridge:Denon DL-160
    Phono Pre:PS Audio GCPH

  8. #8

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    Quote Originally Posted by tcrossma View Post
    So you're saying that you power down the system, swap the front 15's with 9's, power it all back up and it's dead silent. Put the 15's back on the front and there's hiss?

    Or do you have the 9's and the 15's hooked up at the same time?
    yes. thats what is happening
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  9. #9

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    That's strange.

    Did you check your speaker cable connections, and that the terminal ends are not touching each other.

    Could this be due to the sensitivities of each speakers, i.e. the 15's are more sensitive than the 9's, that's why the more sensitive 15's are picking up the noise?

  10. #10

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    the speaker wire is banana plug terminated at both amp/speaker side

    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  11. #11

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    Try switching I/C cables from the receiver to the amps.Then try it without the amp,hooked up to the receiver alone.

  12. #12

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    That kind of hiss is normal, maybe the tweeters are dead in the 9's.
    '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 turd by the clean end."

  13. #13

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    When I had just my AVR hooked up to my LSi15's it was dead quiet. I added the amp, still dead quiet. I then added my Adcom pre-amp, and my 15's had slight hiss. I swapped out my Signal Cable Analog II's from my CD player to my pre-amp with some Kimber Hero's, hiss went away.

    The hiss I was hearing sounded perfectly normal to me, and it's what I have heard in many stereo systems in the past, so I didn't think much of it. So maybe play around with IC's and see if you can at least narrow it down. It may just be a normal side-effect of your components that you'll have to live with. It does seem odd that it's only doing it with your 15's and not the 9's, but there's probably a logical reason for it.
    Speakers: Polk LSi15
    Pre: Adcom GFP-750 with HT Bypass
    Amp: Pass Labs X-150
    CD/DVD Player: Classe CDP-10
    Interconnects: MIT Shortgun S3 Pro XLR
    Speaker cables: MIT MH-750 bi-wire
    TT:Micro Seiki DD-35
    Cartridge:Denon DL-160
    Phono Pre:PS Audio GCPH

  14. #14

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    BTW, just kidding about the dead tweeters. :p

    It does seem rather odd that you don't get the hiss with the 9's.
    '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 turd by the clean end."

  15. #15

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    lol, i'm keeping the 9 and getting rid of the 15s, no 15, no hiss :)
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  16. #16

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    It may have to do with the crossover design difference between the two. That said, the type of hiss you're describing is perfectly normal and should not be considered a problem.
    '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 turd by the clean end."

  17. #17

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    so i did this...connected both the 9 and the 15 to the avr directly...and there is no hiss on both the 9 or the 15

    the problem is in the amp...
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  18. #18
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    Quote Originally Posted by mightymouse View Post

    Could this be due to the sensitivities of each speakers, i.e. the 15's are more sensitive than the 9's, that's why the more sensitive 15's are picking up the noise?
    Yes if one speaker is a few db more sensitive then the noise will be that same level of db louder.

  19. #19
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    Stick a cat in front of the hissing tweeters and watch the battle it out.

  20. #20

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    I took a look at the D-Sonic webpage.

    Looks like those D-Sonic amps are digital amps. Could it be that digital amps have a higher noise floor than conventional class A/B amps? Or it could be D-Sonic's particular implementation of their own digital amps.

    Anyways, if you determined that there is no hiss if you hook the speakers directly to the receiver, then there is nothing wrong with either your LSi9's or your LSi15's. :D


    And one question, how did you manage to plug banana plugs into the back of your LSi9's? It doesn't look like those binding posts on the 9's can accept banana plugs.

  21. #21

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    Quote Originally Posted by wizzy View Post
    Stick a cat in front of the hissing tweeters and watch the battle it out.
    you know i got a cat....and he does not seem to be affected by it
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  22. #22

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    Quote Originally Posted by mightymouse View Post
    I took a look at the D-Sonic webpage.

    Looks like those D-Sonic amps are digital amps. Could it be that digital amps have a higher noise floor than conventional class A/B amps? Or it could be D-Sonic's particular implementation of their own digital amps.

    Anyways, if you determined that there is no hiss if you hook the speakers directly to the receiver, then there is nothing wrong with either your LSi9's or your LSi15's. :D


    And one question, how did you manage to plug banana plugs into the back of your LSi9's? It doesn't look like those binding posts on the 9's can accept banana plugs.
    if you remove the nut, there will be a red/black plastic cap, remove them and there is a hole down the middle of the binding post that you can stick a banana plug into
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  23. #23

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    Thanks for the tip! Didn't realize I can remove those red and black caps.:D

  24. #24
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    Quote Originally Posted by SlowcarIX View Post
    if you remove the nut, there will be a red/black plastic cap, remove them and there is a hole down the middle of the binding post that you can stick a banana plug into
    Ahhh those plastic plugs are most likely there because of the European (CE) safety standards require them.Apparently some countries AC voltage plugs are an exact fit for 3/4" spaced speaker binding posts.

  25. #25

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    another tip...i bought a whole bunch of banana jacks for 3 pairs of presence/surround/back surround...if you use the jacks, you will not be able to mount the speakers flush to the wall...so i just stuff the whole 12gauge thru the hole thru the binding post and crank down the nut
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  26. #26

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    Quote Originally Posted by GV#27 View Post
    Ahhh those plastic plugs are most likely there because of the European (CE) safety standards require them.Apparently some countries AC voltage plugs are an exact fit for 3/4" spaced speaker binding posts.
    i thought those are dust covers....didnt know its for safety

    things you learn everyday :)
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  27. #27
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    Quote Originally Posted by SlowcarIX View Post
    i thought those are dust covers....didnt know its for safety

    things you learn everyday :)
    If the speaker has a CE certification label then I' ll bet thats their purpose.

  28. #28

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    Learn something new here everyday. :)

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