Blew my lsi15 tweeter & crossover-how????

angelsfann02
angelsfann02 Posts: 589
edited August 2011 in Speakers
I was listening to music at about -28dbs ( Pioneer Elite VSX-23 & Emotiva XPA5) for about 20 minutes, one of my lsi15's sounded differently. Upon inspection found tweeter toasted & crossover torched. Other 3 drivers seem fine. I know I will be calling Polk C.S in the morning, but I am baffled that this happened. I have listened to music this loud before for longer periods of time.....please feel free to chime in so I won't have this issue again in the future. I plan to listen at lower levels, but I thought LSI's could take it.
LIVING ROOM:
Pioneer PDP-6070HD, Pioneer Elite SC-25, Pioneer Elite BDP-05FD,
Emotiva XPA-5, Emotiva USP-1, Polk LSI15's, Polk LSiC, Velodyne 12", Mirage Nanosat Prestige rears, MIT AVT Speaker Cables, Audioquest King Cobra Interconnects, Panamax M5300pm Surge Protection/ Power Conditioning
BEDROOM: VIZIO 32" LCD, Pioneer Elite VSX-23txh, Pioneer Elite BDP-23FD, Parasound HCA-2205A, Mirage Nanosat Prestige Speakers 5.1, Mirage S8 Sub, Monoprice cables, APC Surge Protection.
Post edited by angelsfann02 on
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  • nooshinjohn
    nooshinjohn Posts: 25,466
    edited August 2011
    Had a similar experience with mine. I hit mine with way more power than they were designed for and had smoke pouring out of the port on the front. Polk CS was all over it and replaced the crossovers in record time. I am willing to bet the tweets are fine, as the circuit that melted in mine controlled the tweets and they were just fine after replacing the XO's
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
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  • TouchOfEvil
    TouchOfEvil Posts: 967
    edited August 2011
    It's not always about power. If your amp can't handle it this can happen just as easy if not more so. Be sure your amp is not clipping.
    Living Room Rig:D
    Rotel RSP-1069/Rotel RMB-1095/Rotel-1072/Polk lsI15's W/modded xoverW/DBsubs/Polk LsiC/lsI7's/Klipsch sub-12"the weak link"/DLP Mitsubishi 65"
    Xbox360/PS3/WII
    M.Br. setup:)
    Emotiva MMC-1/Rotel RMB-1075/Polk BlackStone TL350's/Velodyne SPL1000/Samsung 51" Plasma
    Computer Rig:
    Rotel RB1050/Tannoy DC4's/Klipsch RW-10d/ImodIpod/HK AVR230 for now....
    Headphones-Ultrasone-HFI780's w/LittleDot MK Vamp Portables Panasonic HJE-900's
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  • PSOVLSK
    PSOVLSK Posts: 5,229
    edited August 2011
    Don't have an answer as to how it happened, but this might be a good time to do the XO upgrade. If you're going to be spending money on new XO's anyway, may as well upgrade. It's a really nice improvement. Just a thought.
    Things work out best for those who make the best of the way things work out.-John Wooden
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  • TouchOfEvil
    TouchOfEvil Posts: 967
    edited August 2011
    PSOVLSK wrote: »
    Don't have an answer as to how it happened, but this might be a good time to do the XO upgrade. If you're going to be spending money on new XO's anyway, may as well upgrade. It's a really nice improvement. Just a thought.

    This is true. Plus with the upgrade they tend to hold a little more power as well.
    Living Room Rig:D
    Rotel RSP-1069/Rotel RMB-1095/Rotel-1072/Polk lsI15's W/modded xoverW/DBsubs/Polk LsiC/lsI7's/Klipsch sub-12"the weak link"/DLP Mitsubishi 65"
    Xbox360/PS3/WII
    M.Br. setup:)
    Emotiva MMC-1/Rotel RMB-1075/Polk BlackStone TL350's/Velodyne SPL1000/Samsung 51" Plasma
    Computer Rig:
    Rotel RB1050/Tannoy DC4's/Klipsch RW-10d/ImodIpod/HK AVR230 for now....
    Headphones-Ultrasone-HFI780's w/LittleDot MK Vamp Portables Panasonic HJE-900's
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  • F1nut
    F1nut Posts: 50,762
    edited August 2011
    There's a 5 watt resistor in the tweeter circuit that is prone to over heating. You most likely hit a transient peak that was just too much for it. It should be replaced with a 10 watt resistor of the same ohm value.
    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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  • angelsfann02
    angelsfann02 Posts: 589
    edited August 2011
    Thanks guys. Emotiva amp never even blinked...AND actually both speakers kept playing, just one sounded muffled suddenly. I tested the tweeter using an old pioneer receiver I have in the garage, but no sound , and it smells fried. The xover was pulled and its fried crispies too. I thought the lsi's were a little tougher than this. Oh well, wonder what this is gonna set me back $$$$$$$
    LIVING ROOM:
    Pioneer PDP-6070HD, Pioneer Elite SC-25, Pioneer Elite BDP-05FD,
    Emotiva XPA-5, Emotiva USP-1, Polk LSI15's, Polk LSiC, Velodyne 12", Mirage Nanosat Prestige rears, MIT AVT Speaker Cables, Audioquest King Cobra Interconnects, Panamax M5300pm Surge Protection/ Power Conditioning
    BEDROOM: VIZIO 32" LCD, Pioneer Elite VSX-23txh, Pioneer Elite BDP-23FD, Parasound HCA-2205A, Mirage Nanosat Prestige Speakers 5.1, Mirage S8 Sub, Monoprice cables, APC Surge Protection.
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  • DMara
    DMara Posts: 1,434
    edited August 2011
    I don't think it will cost much, Lou. By the way I agree with others, you should go for the XO mod, this is quite an opportunity to do so :smile:
    Gears shared to both living room & bedroom:
    Integra DHC-80.3 / Oppo BDP-105 / DirecTV HR24 DVR /APC S15blk PC-UPS
    Living room:
    LSiM707's / LSiM706c / LSiM702 F/X's / dual JL Audio Fathom F113's / Parasound Halo A51 / Panasonic 65" TC-P65VT50
    Bedroom:
    Usher Dancer Mini 2 Diamond DMD's / Logitech SB Touch / W4S STP-SE / W4S DAC-2 / W4S ST-1000 / Samsung 52" LN52B750
    Other rooms:
    Audioengine AP4's / GLOW Audio Sub One / audio-gd NFB-3 DAC / Audioengine N22
    audio-gd NFB-10.2 / Denon AH-D7000
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  • angelsfann02
    angelsfann02 Posts: 589
    edited August 2011
    Guys know what the xover mod costs? Pm if you like.
    LIVING ROOM:
    Pioneer PDP-6070HD, Pioneer Elite SC-25, Pioneer Elite BDP-05FD,
    Emotiva XPA-5, Emotiva USP-1, Polk LSI15's, Polk LSiC, Velodyne 12", Mirage Nanosat Prestige rears, MIT AVT Speaker Cables, Audioquest King Cobra Interconnects, Panamax M5300pm Surge Protection/ Power Conditioning
    BEDROOM: VIZIO 32" LCD, Pioneer Elite VSX-23txh, Pioneer Elite BDP-23FD, Parasound HCA-2205A, Mirage Nanosat Prestige Speakers 5.1, Mirage S8 Sub, Monoprice cables, APC Surge Protection.
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  • angelsfann02
    angelsfann02 Posts: 589
    edited August 2011
    DMara wrote: »
    I don't think it will cost much, Lou. By the way I agree with others, you should go for the XO mod, this is quite an opportunity to do so :smile:

    Have you done the xover mods?
    LIVING ROOM:
    Pioneer PDP-6070HD, Pioneer Elite SC-25, Pioneer Elite BDP-05FD,
    Emotiva XPA-5, Emotiva USP-1, Polk LSI15's, Polk LSiC, Velodyne 12", Mirage Nanosat Prestige rears, MIT AVT Speaker Cables, Audioquest King Cobra Interconnects, Panamax M5300pm Surge Protection/ Power Conditioning
    BEDROOM: VIZIO 32" LCD, Pioneer Elite VSX-23txh, Pioneer Elite BDP-23FD, Parasound HCA-2205A, Mirage Nanosat Prestige Speakers 5.1, Mirage S8 Sub, Monoprice cables, APC Surge Protection.
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  • DMara
    DMara Posts: 1,434
    edited August 2011
    angelsfann02 wrote: »
    Have you done the xover mods?

    Not yet, but that will be my next move, soon. I've been doing some research, and it seems to be one of the easier mods.
    Gears shared to both living room & bedroom:
    Integra DHC-80.3 / Oppo BDP-105 / DirecTV HR24 DVR /APC S15blk PC-UPS
    Living room:
    LSiM707's / LSiM706c / LSiM702 F/X's / dual JL Audio Fathom F113's / Parasound Halo A51 / Panasonic 65" TC-P65VT50
    Bedroom:
    Usher Dancer Mini 2 Diamond DMD's / Logitech SB Touch / W4S STP-SE / W4S DAC-2 / W4S ST-1000 / Samsung 52" LN52B750
    Other rooms:
    Audioengine AP4's / GLOW Audio Sub One / audio-gd NFB-3 DAC / Audioengine N22
    audio-gd NFB-10.2 / Denon AH-D7000
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  • PSOVLSK
    PSOVLSK Posts: 5,229
    edited August 2011
    Here' some info for you.

    http://www.polkaudio.com/forums/showthread.php?t=118558
    Things work out best for those who make the best of the way things work out.-John Wooden
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  • Face
    Face Posts: 14,340
    edited August 2011
    Can you solder? If it appears you burnt out the resistors in series with your tweeters, pick up a pair of Mills 2.0ohm resistors from Sonic Craft or Parts Express and you should be good to go. If you destroyed a tweeter, you need to replacement from Polk as their made specially for the LSi series.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • Face
    Face Posts: 14,340
    edited August 2011
    Here you go: http://www.parts-express.com/pe/showdetl.cfm?Partnumber=005-2
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • angelsfann02
    angelsfann02 Posts: 589
    edited August 2011
    :frown: here is a pic of the xover
    LIVING ROOM:
    Pioneer PDP-6070HD, Pioneer Elite SC-25, Pioneer Elite BDP-05FD,
    Emotiva XPA-5, Emotiva USP-1, Polk LSI15's, Polk LSiC, Velodyne 12", Mirage Nanosat Prestige rears, MIT AVT Speaker Cables, Audioquest King Cobra Interconnects, Panamax M5300pm Surge Protection/ Power Conditioning
    BEDROOM: VIZIO 32" LCD, Pioneer Elite VSX-23txh, Pioneer Elite BDP-23FD, Parasound HCA-2205A, Mirage Nanosat Prestige Speakers 5.1, Mirage S8 Sub, Monoprice cables, APC Surge Protection.
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  • nooshinjohn
    nooshinjohn Posts: 25,466
    edited August 2011
    That is exactly where mine failed.
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
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  • angelsfann02
    angelsfann02 Posts: 589
    edited August 2011
    Im gonna be hesitant to play them loud again. I thought these things loved power :'(
    LIVING ROOM:
    Pioneer PDP-6070HD, Pioneer Elite SC-25, Pioneer Elite BDP-05FD,
    Emotiva XPA-5, Emotiva USP-1, Polk LSI15's, Polk LSiC, Velodyne 12", Mirage Nanosat Prestige rears, MIT AVT Speaker Cables, Audioquest King Cobra Interconnects, Panamax M5300pm Surge Protection/ Power Conditioning
    BEDROOM: VIZIO 32" LCD, Pioneer Elite VSX-23txh, Pioneer Elite BDP-23FD, Parasound HCA-2205A, Mirage Nanosat Prestige Speakers 5.1, Mirage S8 Sub, Monoprice cables, APC Surge Protection.
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  • blehmbo
    blehmbo Posts: 179
    edited August 2011
    How were your tone controls set when the incident occured?
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  • mantis
    mantis Posts: 17,204
    edited August 2011
    -28 is not even that loud. If you where at -2 or 0 then I could say yeah you where over driving your speakers but not really.
    When I had the LSI15's I had my B&K at reference levels many times and they sounded sweet. No clipping or distortion of any kind. I was very proud of the clarity I got at high volumes. Yes they love to be pushed.
    I'm wondering if their is a fault in that resistor? If more then one person had the same problem , maybe a bad run?
    Dan
    My personal quest is to save to world of bad audio, one thread at a time.
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  • ben62670
    ben62670 Posts: 15,969
    edited August 2011
    Did you have the treble turned up? I have rebuilt over 100 crossovers for Polkies if you want it upgraded. If you are good at soldering fallow face's advice and replace the 5w resistor with a 12 watter.
    Ben

    Edit: If you have a multi meter check the ohms of just the tweeter out of the cabinet.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • F1nut
    F1nut Posts: 50,762
    edited August 2011
    angelsfann02 wrote: »
    Im gonna be hesitant to play them loud again. I thought these things loved power :'(

    I hate repeating myself, but.....
    There's a 5 watt resistor in the tweeter circuit that is prone to over heating. You most likely hit a transient peak that was just too much for it. It should be replaced with a 10 watt resistor of the same ohm value.
    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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  • DMara
    DMara Posts: 1,434
    edited August 2011
    angelsfann02 wrote: »
    Im gonna be hesitant to play them loud again. I thought these things loved power :'(

    I've almost always played my LSi15's at my Denon AVR-4810ci's reference level, so I don't think the issue was playing them loud at all.
    Gears shared to both living room & bedroom:
    Integra DHC-80.3 / Oppo BDP-105 / DirecTV HR24 DVR /APC S15blk PC-UPS
    Living room:
    LSiM707's / LSiM706c / LSiM702 F/X's / dual JL Audio Fathom F113's / Parasound Halo A51 / Panasonic 65" TC-P65VT50
    Bedroom:
    Usher Dancer Mini 2 Diamond DMD's / Logitech SB Touch / W4S STP-SE / W4S DAC-2 / W4S ST-1000 / Samsung 52" LN52B750
    Other rooms:
    Audioengine AP4's / GLOW Audio Sub One / audio-gd NFB-3 DAC / Audioengine N22
    audio-gd NFB-10.2 / Denon AH-D7000
    · Share on FacebookShare on Twitter
  • angelsfann02
    angelsfann02 Posts: 589
    edited August 2011
    mantis wrote: »
    -28 is not even that loud. If you where at -2 or 0 then I could say yeah you where over driving your speakers but not really.
    When I had the LSI15's I had my B&K at reference levels many times and they sounded sweet. No clipping or distortion of any kind. I was very proud of the clarity I got at high volumes. Yes they love to be pushed.
    I'm wondering if their is a fault in that resistor? If more then one person had the same problem , maybe a bad run?

    Yeah man, I would never get anyone near -2 dbs. I dont even dip into the low -20's. The 15's get too loud for me at those levels. F1 & Ben, I will heed the warning and replace those to 12watts. Ben I will pm you as I have never soldered, but Im not afraid to try either.....
    LIVING ROOM:
    Pioneer PDP-6070HD, Pioneer Elite SC-25, Pioneer Elite BDP-05FD,
    Emotiva XPA-5, Emotiva USP-1, Polk LSI15's, Polk LSiC, Velodyne 12", Mirage Nanosat Prestige rears, MIT AVT Speaker Cables, Audioquest King Cobra Interconnects, Panamax M5300pm Surge Protection/ Power Conditioning
    BEDROOM: VIZIO 32" LCD, Pioneer Elite VSX-23txh, Pioneer Elite BDP-23FD, Parasound HCA-2205A, Mirage Nanosat Prestige Speakers 5.1, Mirage S8 Sub, Monoprice cables, APC Surge Protection.
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  • newsman
    newsman Posts: 203
    edited August 2011
    So LSi15th crossover attached to the binding post plate? Interesting. Who does the XO Mods for the Polks? Anyway, I play my LSi15 at -25 to - 20db all the time - and they never have a problem, nor do they become obnoxiously loud at that volume. Maybe my hearing is shot. :tongue:
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  • tonyb
    tonyb Posts: 33,015
    edited August 2011
    angelsfann02 wrote: »
    Yeah man, I would never get anyone near -2 dbs. I dont even dip into the low -20's. The 15's get too loud for me at those levels. F1 & Ben, I will heed the warning and replace those to 12watts. Ben I will pm you as I have never soldered, but Im not afraid to try either.....

    Personally bro, if you are unsure of your soldering capabilities, just send the crossover out to someone willing to rebuild it for you. You can do more damage to the board if your not carefull.
    HT SYSTEM-
    Sony 850c 4k
    Pioneer elite vhx 21
    Sony 4k BRP
    SVS SB-2000
    Polk Sig. 20's
    Polk FX500 surrounds

    Cables-
    Acoustic zen Satori speaker cables
    Acoustic zen Matrix 2 IC's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable

    Kitchen

    Sonos zp90
    Grant Fidelity tube dac
    B&k 1420
    lsi 9's
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  • grimmace19
    grimmace19 Posts: 1,429
    edited August 2011
    I get my 15's blasting way past those levels all the time with no issues on my adcom gfa-7500.
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  • cembros
    cembros Posts: 172
    edited August 2011
    Thats odd, I blast mine for extended periods of time with zero issues. The speakers handle it effortlessly.
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  • angelsfann02
    angelsfann02 Posts: 589
    edited August 2011
    I hope it was just a bad batch of resistors, and that my Emo amp was not responsible for the damage. (Clipping) When I do fix everything, part of me wants to play music at those same db's to see if it was the amp. Whats wrong with me!
    LIVING ROOM:
    Pioneer PDP-6070HD, Pioneer Elite SC-25, Pioneer Elite BDP-05FD,
    Emotiva XPA-5, Emotiva USP-1, Polk LSI15's, Polk LSiC, Velodyne 12", Mirage Nanosat Prestige rears, MIT AVT Speaker Cables, Audioquest King Cobra Interconnects, Panamax M5300pm Surge Protection/ Power Conditioning
    BEDROOM: VIZIO 32" LCD, Pioneer Elite VSX-23txh, Pioneer Elite BDP-23FD, Parasound HCA-2205A, Mirage Nanosat Prestige Speakers 5.1, Mirage S8 Sub, Monoprice cables, APC Surge Protection.
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  • Face
    Face Posts: 14,340
    edited August 2011
    Do you have a DMM? I would check your amp's DC offset: http://www.rock-grotto.co.uk/dcoffset.htm The diagrams show a headphone jack, adjust for your speaker terminals.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • angelsfann02
    angelsfann02 Posts: 589
    edited August 2011
    Sorry, whats a DMM?
    LIVING ROOM:
    Pioneer PDP-6070HD, Pioneer Elite SC-25, Pioneer Elite BDP-05FD,
    Emotiva XPA-5, Emotiva USP-1, Polk LSI15's, Polk LSiC, Velodyne 12", Mirage Nanosat Prestige rears, MIT AVT Speaker Cables, Audioquest King Cobra Interconnects, Panamax M5300pm Surge Protection/ Power Conditioning
    BEDROOM: VIZIO 32" LCD, Pioneer Elite VSX-23txh, Pioneer Elite BDP-23FD, Parasound HCA-2205A, Mirage Nanosat Prestige Speakers 5.1, Mirage S8 Sub, Monoprice cables, APC Surge Protection.
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  • nooshinjohn
    nooshinjohn Posts: 25,466
    edited August 2011
    digital multi-meter
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
    · Share on FacebookShare on Twitter