LSiC crackle when playing pink noise

Picked up two LSi15's and a LSiC from CraigsList recently, powered by two Rotel amps I picked up earlier this year.

The center channel tweeter has a crackle. First noticed with movie audio. Tested with pink noise played through multiple amps, multiple channels, multiple connects, and multiple speaker wires. Definitely the speaker, and not the content or power system.

I don't think the tweeter is blown. I could test it in the other speakers. Fairly certain it's something in the crossover. Based on the known issues with resistors, I ordered new resistors to try first.

http://forum.polkaudio.com/discussion/162585/lsi15-tweeters-not-working#Comment_2064018

https://www.parts-express.com/mills-2-ohm-12w-non-inductive-resistor--005-2

They come in next week. Will post updates.

The LSi15s sound great. Dialed them in today.

Comments

  • mlistens03mlistens03 Posts: 2,246
    tn2036 wrote: »
    Picked up two LSi15's and a LSiC from CraigsList recently, powered by two Rotel amps I picked up earlier this year.

    The center channel tweeter has a crackle. First noticed with movie audio. Tested with pink noise played through multiple amps, multiple channels, multiple connects, and multiple speaker wires. Definitely the speaker, and not the content or power system.

    I don't think the tweeter is blown. I could test it in the other speakers. Fairly certain it's something in the crossover. Based on the known issues with resistors, I ordered new resistors to try first.

    http://forum.polkaudio.com/discussion/162585/lsi15-tweeters-not-working#Comment_2064018

    https://www.parts-express.com/mills-2-ohm-12w-non-inductive-resistor--005-2

    They come in next week. Will post updates.

    The LSi15s sound great. Dialed them in today.

    good luck with the repair! The LSi series is awesome, and you will enjoy them.
    Micah
    Micah

    Main system: Technics SL3200, Shure M97xE, Lafayette LR1100 for tuner, Hagerman Audio Labs Bugle 2 phono stage, NAD C352 integrated, Boston Acoustics VR 2, Boston PV500, generic ICs, and BJC Belden speaker cables.

    Desktop: Dell Precision 690 running iTunes, Yamaha RX-v665, Monitor Audio R90s, Velodyne VA-907, generic ICs and speaker cables.
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.
  • F1nutF1nut Posts: 40,528
    It's not a resistor, you have a bad tweeter.
    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."


  • mlistens03mlistens03 Posts: 2,246
    edited June 21
    F1nut wrote: »
    It's not a resistor, you have a bad tweeter.

    But he said he switched the tweeters around, and the noise stayed with the cabinet, not the tweeter. I thought the same as you when I first read the post, until I read that.
    Edit: oh you said you COULD, not you DID. In that case, it probably is the tweeters voice coil rubbing the side of the motor assembly.
    Micah
    Micah

    Main system: Technics SL3200, Shure M97xE, Lafayette LR1100 for tuner, Hagerman Audio Labs Bugle 2 phono stage, NAD C352 integrated, Boston Acoustics VR 2, Boston PV500, generic ICs, and BJC Belden speaker cables.

    Desktop: Dell Precision 690 running iTunes, Yamaha RX-v665, Monitor Audio R90s, Velodyne VA-907, generic ICs and speaker cables.
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.
  • tn2036tn2036 Posts: 4
    Thank you; Any ideas for a suitable aftermarket replacement? Just called Polk and they no longer have replacements in stock.
  • mlistens03mlistens03 Posts: 2,246
    tn2036 wrote: »
    Thank you; Any ideas for a suitable aftermarket replacement? Just called Polk and they no longer have replacements in stock.

    I know peerless makes some ring radiator tweeters available on parts express, but I don’t think they will work without crossover modifications. I also don’t know if the new LSIM tweeters will work, but it seems unlikely.
    Look on eBay and similar sites to find used replacements.
    Micah

    Main system: Technics SL3200, Shure M97xE, Lafayette LR1100 for tuner, Hagerman Audio Labs Bugle 2 phono stage, NAD C352 integrated, Boston Acoustics VR 2, Boston PV500, generic ICs, and BJC Belden speaker cables.

    Desktop: Dell Precision 690 running iTunes, Yamaha RX-v665, Monitor Audio R90s, Velodyne VA-907, generic ICs and speaker cables.
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.
  • rooftop59rooftop59 Posts: 4,645
    tn2036 wrote: »
    I don't think the tweeter is blown. I could test it in the other speakers.

    he didn't actually test it in other speakers. Almost certainly the tweet. I know it sounds ridiculous, but if you got a really good deal I would just buy another center on ebay. Either sell the extra drivers or keep them as spares. Finding the proper replacement will be very difficult.

    Someone on the forum was selling a center really cheap. They might sell to you (some of us only sell to active members with 100+ posts, but that's entirely up to the seller).
    HT Rig:
    Denon AVR-X4200w; Peachtree Audio Nova Integrated; Bryson BPD-1; Mains: Dynaudio Emit 10 + MartinLogan Dynamo (original) sub; Center - Polk cs400i; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - SVS PB10-ISD; LG UP870 4K BDP

    Master Bedroom
    Marantz SR-5007; Peachtree Audio NovaPre; Audiosource Amp Two, PSB Imagine B, Boston VR-10 center, NHT Super One CI surrounds, ACI Titan subwoofer, Squeezebox Touch
  • mlistens03mlistens03 Posts: 2,246
    Micah

    Main system: Technics SL3200, Shure M97xE, Lafayette LR1100 for tuner, Hagerman Audio Labs Bugle 2 phono stage, NAD C352 integrated, Boston Acoustics VR 2, Boston PV500, generic ICs, and BJC Belden speaker cables.

    Desktop: Dell Precision 690 running iTunes, Yamaha RX-v665, Monitor Audio R90s, Velodyne VA-907, generic ICs and speaker cables.
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.
  • K_MK_M Posts: 1,036
    edited June 22
    what is the going price of the Vifa/Lsi tweeter (used) now?

    I found one damaged on Ebay for $39.99, sounds a bit steep, for a damaged item.
    The brand new Vifa XT25tg30 is only like $32.00 on parts express.....
    Lsi15, Lsi9, LsiC,Rta11t,M5jr+,M4,SDA 3.1TL, SDA SRS 2.3TL, Rti6....Still listing stuff, a work in progress.
    B+W-
    Epos-
    Infinity-
    Advent-

  • rooftop59rooftop59 Posts: 4,645
    K_M wrote: »
    what is the going price of the Vifa/Lsi tweeter (used) now?

    I found one damaged on Ebay for $39.99, sounds a bit steep, for a damaged item.
    The brand new Vifa XT25tg30 is only like $32.00 on parts express.....

    Find one and let us know ;)
    HT Rig:
    Denon AVR-X4200w; Peachtree Audio Nova Integrated; Bryson BPD-1; Mains: Dynaudio Emit 10 + MartinLogan Dynamo (original) sub; Center - Polk cs400i; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - SVS PB10-ISD; LG UP870 4K BDP

    Master Bedroom
    Marantz SR-5007; Peachtree Audio NovaPre; Audiosource Amp Two, PSB Imagine B, Boston VR-10 center, NHT Super One CI surrounds, ACI Titan subwoofer, Squeezebox Touch
  • mlistens03mlistens03 Posts: 2,246
    K_M wrote: »
    what is the going price of the Vifa/Lsi tweeter (used) now?

    I found one damaged on Ebay for $39.99, sounds a bit steep, for a damaged item.
    The brand new Vifa XT25tg30 is only like $32.00 on parts express.....

    But that isn’t the same tweeter. The Vifa tweeters used in the LSi series was better I believe.

    Also, doesn’t the LSi15 have a different impedance tweeter than the LSiC? Or is that just the midbass drivers? If so, then you have to make sure that I feel you buy one it isn’t from a LSi15.
    Micah

    Main system: Technics SL3200, Shure M97xE, Lafayette LR1100 for tuner, Hagerman Audio Labs Bugle 2 phono stage, NAD C352 integrated, Boston Acoustics VR 2, Boston PV500, generic ICs, and BJC Belden speaker cables.

    Desktop: Dell Precision 690 running iTunes, Yamaha RX-v665, Monitor Audio R90s, Velodyne VA-907, generic ICs and speaker cables.
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.
  • VR3VR3 Posts: 22,274
    Polk claims to alter the vifa tweeters, but they simply alter the faceplate, which can be swapped
    - Not Tom

    Vr3Mods.com ///// Version3Audio.com

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • K_MK_M Posts: 1,036
    edited June 23
    mlistens03 wrote: »
    K_M wrote: »
    what is the going price of the Vifa/Lsi tweeter (used) now?

    I found one damaged on Ebay for $39.99, sounds a bit steep, for a damaged item.
    The brand new Vifa XT25tg30 is only like $32.00 on parts express.....

    But that isn’t the same tweeter. The Vifa tweeters used in the LSi series was better I believe.

    Also, doesn’t the LSi15 have a different impedance tweeter than the LSiC? Or is that just the midbass drivers? If so, then you have to make sure that I feel you buy one it isn’t from a LSi15.

    The lsiC and Lsi15 and all the lsi line use the same tweeter.
    The midbass drivers are wired in series in the Lsi15, and are slightly different in some minor ways, but if I remember correctly they were actually all 4 ohm drivers, but the impedance peak (and Qts) value was slightly different.

    In comparing both midbass drivers (we have several Lsi models) it was not apparent which was being used. So they are not all "that" different in reality.
    Lsi15, Lsi9, LsiC,Rta11t,M5jr+,M4,SDA 3.1TL, SDA SRS 2.3TL, Rti6....Still listing stuff, a work in progress.
    B+W-
    Epos-
    Infinity-
    Advent-

  • mlistens03mlistens03 Posts: 2,246
    K_M wrote: »
    mlistens03 wrote: »
    K_M wrote: »
    what is the going price of the Vifa/Lsi tweeter (used) now?

    I found one damaged on Ebay for $39.99, sounds a bit steep, for a damaged item.
    The brand new Vifa XT25tg30 is only like $32.00 on parts express.....

    But that isn’t the same tweeter. The Vifa tweeters used in the LSi series was better I believe.

    Also, doesn’t the LSi15 have a different impedance tweeter than the LSiC? Or is that just the midbass drivers? If so, then you have to make sure that I feel you buy one it isn’t from a LSi15.

    The lsiC and Lsi15 and all the lsi line use the same tweeter.
    The midbass drivers are wired in series in the Lsi15, and are slightly different in some minor ways, but if I remember correctly they were actually all 4 ohm drivers, but the impedance peak (and Qts) value was slightly different.

    In comparing both midbass drivers (we have several Lsi models) it was not apparent which was being used. So they are not all "that" different in reality.

    Ok, good to know.
    I had a terrible dream last night where I came upstairs and the cone in both midbass drivers had fallen out and was sitting on the ground, then the dog stepped on them and crushed them. Now I know that I can use the LSi15 drivers! :wink:
    Micah

    Main system: Technics SL3200, Shure M97xE, Lafayette LR1100 for tuner, Hagerman Audio Labs Bugle 2 phono stage, NAD C352 integrated, Boston Acoustics VR 2, Boston PV500, generic ICs, and BJC Belden speaker cables.

    Desktop: Dell Precision 690 running iTunes, Yamaha RX-v665, Monitor Audio R90s, Velodyne VA-907, generic ICs and speaker cables.
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.
  • mlistens03mlistens03 Posts: 2,246
    Micah

    Main system: Technics SL3200, Shure M97xE, Lafayette LR1100 for tuner, Hagerman Audio Labs Bugle 2 phono stage, NAD C352 integrated, Boston Acoustics VR 2, Boston PV500, generic ICs, and BJC Belden speaker cables.

    Desktop: Dell Precision 690 running iTunes, Yamaha RX-v665, Monitor Audio R90s, Velodyne VA-907, generic ICs and speaker cables.
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.
  • mlistens03mlistens03 Posts: 2,246
    edited June 23
    double Post...
    Post edited by mlistens03 on
    Micah

    Main system: Technics SL3200, Shure M97xE, Lafayette LR1100 for tuner, Hagerman Audio Labs Bugle 2 phono stage, NAD C352 integrated, Boston Acoustics VR 2, Boston PV500, generic ICs, and BJC Belden speaker cables.

    Desktop: Dell Precision 690 running iTunes, Yamaha RX-v665, Monitor Audio R90s, Velodyne VA-907, generic ICs and speaker cables.
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.
  • tn2036tn2036 Posts: 4
    on Parts Express...

    https://www.parts-express.com/peerless-by-tymphany-xt25tg30-04-1-dual-ring-radiator-tweeter--264-1016

    Many commenters / reviews indicating they use this as a replacement for the Polk LSi series

  • mlistens03mlistens03 Posts: 2,246
    tn2036 wrote: »
    on Parts Express...

    https://www.parts-express.com/peerless-by-tymphany-xt25tg30-04-1-dual-ring-radiator-tweeter--264-1016

    Many commenters / reviews indicating they use this as a replacement for the Polk LSi series

    A lot of people do, but I believe it is a different tweeter, which means that it will sound different. It I should possible that it’s the same, but I doubt it.
    I would just contact @dbryant about his LSiC to see if he still has one left. If so, he has them priced as a steal at around $140, and then you will have every driver except for the tweeer should they go bad in any one of your other speakers.
    Micah
    Micah

    Main system: Technics SL3200, Shure M97xE, Lafayette LR1100 for tuner, Hagerman Audio Labs Bugle 2 phono stage, NAD C352 integrated, Boston Acoustics VR 2, Boston PV500, generic ICs, and BJC Belden speaker cables.

    Desktop: Dell Precision 690 running iTunes, Yamaha RX-v665, Monitor Audio R90s, Velodyne VA-907, generic ICs and speaker cables.
    I've always thought the goal of high-end audio was not to have your neighbors bang on the wall and say, 'Turn that darn music down' but to have your neighbors bang on the wall and say, 'Tell your friends to go home and you can practice later this week'.
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