LSi 9s Suddenly Sound "Different"

docloude
docloude Posts: 4
edited May 2010 in Troubleshooting
Hello All,

Recently, while playing some music (I guess a little too loud :) ), the "sound" of my LSi9s suddenly changed.

It seems as though they had lost some their upper end. I immediately thought that I had blown a tweeter, but they are still working.

This past weekend, I pulled each and every driver from each speaker and tested them to insure that they were working.... they were. So, I then pulled one of the crossover networks and discovered that the 3 ohm (5 watt) resistor used on the tweeter side apparently had become so hot that it has literally "unglued" itself from the circuit board and one of the "legs" of the resistor has de-soldered itself and is completely disconnected from the board.:eek:

I pulled the network on the other speaker and found it to be exactly the same way.

My question is (thinking that these resistors are merely to protect the tweeters - but the tweeters are still "operating") do they influence the overall sound? Obviously, I will be replacing the resistor (not a problem), but I'm concerned about the quality of the OEM as opposed choosing somthing better (such as a Mills 3 ohm - 12 watt).

Any thoughts .....
Post edited by docloude on
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Comments

  • ben62670
    ben62670 Posts: 15,969
    edited May 2010
    Welcome to Club Polk. The resistor needs to be replaced, and you have made a good choice for replacement. I would order two of them so you can keep them the same. What are you driving them with?
    Ben
    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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  • docloude
    docloude Posts: 4
    edited May 2010
    Hello Ben, thanks for the reply.

    At the time, they were being driven by an Outlaw Model 755. They will now be driven by an Emotiva XPA-2.

    Thanks again.
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  • ben62670
    ben62670 Posts: 15,969
    edited May 2010
    That will work. LSI's run much better on an amp. If you hear distortion turn it down. When removing the resistors use a heat gun to loose the glue.
    Enjoy
    Ben
    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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  • docloude
    docloude Posts: 4
    edited May 2010
    Great, thanks for your help Ben.

    Oh, by the way, they're already unglued :)

    David
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  • Face
    Face Posts: 14,340
    edited May 2010
    I agree, go with Mills.

    As for why the tweeters are still working, the resistor is in parallel with a capacitor which will still complete the circuit, but will sound odd.
    "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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  • docloude
    docloude Posts: 4
    edited May 2010
    Thanks Face. "Odd" is a very good description.
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