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  1. #1

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    Question Lsi15 tweeters not working

    hello,

    I'm used to being knowledgeable and helpful on forums, but in the electronics/audio arena I am a complete ignoramus... so my apology for a "dumb" question.

    I have two Lsi15 towers and and an LsiC center... had been running these at very moderate volume on a $500 yamaha receiver (not sure of model as I don't have it anymore).. I mostly watched movies and listened to low volume music as I live in a condo complex.

    My tweeters however have stopped working... I changed out the receiver to another yamaha one which has 140W x 5 channels, and still no tweeters. I looked at the crossovers and there are no visible burn signs or physical damage, and also switched in my lsiC tweeter to see if my actual tweeters were blown.. but when I put my functioning tweeter in the towers there was still no signal.

    does any forum member have suggestions for me?

    thank you.

  2. #2

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    Try the 15's tweeters in your center speaker. That is the easiest way to test. Make sure your brass jumpers are in place on the binding posts on the 15s.

  3. #3

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    Quote Originally Posted by Dennis Gardner View Post
    Try the 15's tweeters in your center speaker. That is the easiest way to test. Make sure your brass jumpers are in place on the binding posts on the 15s.
    that's what I tried... I took the tweeter out of the center and put into the towers... while the actual unit worked while in the center speaker, once i put it into either of the towers it stopped working... so it's something about the signal which goes to the tweeters in the towers which is the issue.

    the gold bridges are in place, but I also tried removing them and plugging in separate wires for the top black and red plugs... still nothing from the tweeters.

    so to summarize:
    -it's definitely NOT the actual tweeters which aren't working.
    -it's definitely NOT the receiver as I've changed it out.
    -the bridges ARE in place, but even with the top set of plugs connected I still have no tweeter sound.

    hope that helps eliminat a few variables.

  4. #4

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    If the tweeters aren't blown, then it must be an issue with your crossover, or wiring within the speaker. You have performed the easiest tests. It is rare for both speakers to go out at the same time.

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    Replace the 5 watt resistors in the high frequency circuit regardless of how they look. Use Mills 12 watt of the proper ohm value
    'Political Correctness'.........defined

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  6. #6

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    Quote Originally Posted by alexio View Post
    I have two Lsi15 towers and and an LsiC center... had been running these at very moderate volume on a $500 yamaha receiver (not sure of model as I don't have it anymore)..
    That's your problem right there. That entry level receiver can't drive 4 ohm speakers. You most likely toasted something in the crossover. Maybe open up the back and take a peek, see if anything is burned up on the crossover.

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    Default replacing crossovers

    got in touch with Polk, and it looks like I'll be ordering some crossovers to replace mine, $70 each sounds reasonable.

    my problem now is that the wires are soldered, to the crossover, which means that they need to be unclipped from the speakers ttthemselves. This wouldn't be an issue except I don't know how I would thread the wires back UP to the tweeter and the drivers at the top of the speaker... when I pull on them the feel VERY snug... and I imagine there is probabaly a barrier inbetwen the top and bottom of the speaker.

    anyone have any idea how the LSI are constructed, and how one would go about dealing with the crossover replacement?

    thank you again.

  8. #8

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    You don't need new crossovers. You need to replace the 5 watt resistor in the high frequency circuit with a 12 watt Mills. Replacing the entire crossover will not prevent the failure from happening again.
    'Political Correctness'.........defined

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    Quote Originally Posted by F1nut View Post
    You don't need new crossovers. You need to replace the 5 watt resistor in the high frequency circuit with a 12 watt Mills. Replacing the entire crossover will not prevent the failure from happening again.
    a 12 watt Mills?.. ok, is this it? http://www.parts-express.com/mills-1...sistor--005-15

    I'm finding different ohm ones, different impedance I believe that is? is it the 10 or the 15 ohm?

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    No, you need a 2 ohm, 12 watt Mills. This resistor location is marked R1 on the board. Order from http://www.soniccraft.com/

    You do own a soldering gun, yes?

    I will not guarantee 100% that this will fix your problem, but it is a well documented issue with the LSi's and much cheaper than replacing the boards. In your case, trying to drive 4 ohm speakers with an AVR that isn't rated to do so would easily cause clipping (distortion), which will overheat the resistor causing failure. I'm actually surprised you didn't cook the AVR.

    Just in case, if you do actually have to replace the crossovers simply desolder the wires at the board marking which goes where. That way you don't have to pull or feed wire.
    'Political Correctness'.........defined

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    Default i need advice on changing my csi3 center channel to a higher circuit

    i ordered new crossovers for my csi3 center channel under warrenty my trouble is trying to run my rti12 that can handle the high volume but not the csi3 would changing mine (resister and capasitor) kep me from over heating the board i just posted a question on this i do not want to spend 1,000 on a 2 channel power supply. my onkyo 818 does just fine. other speakers center and 2 bookshelf, infinity no matter what abuse i put to them they keep on, keep on.....

    p.s. the main drivers not the tweeter on mine is going out always just one, the same one

    Quote Originally Posted by F1nut View Post
    You don't need new crossovers. You need to replace the 5 watt resistor in the high frequency circuit with a 12 watt Mills. Replacing the entire crossover will not prevent the failure from happening again.

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    Nothing is going to keep you from frying your speaker if you can't get the sticky fingers on the volume under control. That's the bottom line.

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    Quote Originally Posted by roadmap View Post
    i ordered new crossovers for my csi3 center channel under warrenty my trouble is trying to run my rti12 that can handle the high volume but not the csi3 would changing mine (resister and capasitor) kep me from over heating the board i just posted a question on this i do not want to spend 1,000 on a 2 channel power supply. my onkyo 818 does just fine. other speakers center and 2 bookshelf, infinity no matter what abuse i put to them they keep on, keep on.....

    p.s. the main drivers not the tweeter on mine is going out always just one, the same one
    That's a small center to run with the RTi12's. I'm guessing you are running too hot trying to keep up with the RTi12's. You need to dial it down in the calibration program or get a bigger center.
    'Political Correctness'.........defined

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    Quote Originally Posted by F1nut View Post
    That's a small center to run with the RTi12's. I'm guessing you are running too hot trying to keep up with the RTi12's. You need to dial it down in the calibration program or get a bigger center.
    Good advice there. I might add that you don't need to spend a thousand bucks for a 2 channel amp. Half that would suffice. The 12's really need an amp anyway to sound their best. At higher volumes, that receiver is working overtime, take some stress off and invest 500 bucks for a good amp on the used market. A bigger center speaker and a 3 channel amp would be ideal though.

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    Default Problem solved, thank you

    Big thank you to all those who provided advice in this thread. This morning we were able to quite easily replace the resistor with the Mills units suggested, and my speakers are back to their glorious sounding selves again. Here is a picture as reference for others looking to undertake this minor repair.

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    Good, glad that worked out. Keep in mind that the 12 watt resistor will take more heat than the original 5 watt, so if you keep driving your speakers with the same AVR the next time it will likely take out the tweeters.
    'Political Correctness'.........defined

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