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  1. #1

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    Default Monitor 7B blown mid?

    I have some 7B's that have been very good to me. But I think my Sansui receiver blew out my mid on 1 speaker. The left channel sounds like crap even with headphones. So I plugged my left speaker to the right side and it still sound scratchy. I changed the fuse and no difference. How can I tell if the crossover or mid is bad?

    On another note, I've been looking thru some old post here and was wondering how I can tell if my 7's have Peerless tweeters.

    Thanks
    Mike

  2. #2

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    Pull the mid bass out of the speaker, and test it with a continuity tester, or an ohm meter. If you don't have either of those you can take a aa or aaa battery and some wire and run the power through the woofer. If the woofer jumps it usually means it is good. As for the tweeters if the wires on the face of the tweeter run at about a 45 degree angle down from the the sides of the driver they are peerless. If the wires run straight out they are of the SL variety.

    Merry Christmas Ben

  3. #3

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    First note: If the speaker is producing mid to bass sound, the speaker is working. Gently push on the passive and listen if the mid is moving freely. It should move but not scrape. You said it sounded scratchy even with headphones. May be you receiver or an intermitent short in the wires. Could be dirty contacts, check and clean all connnections and maybe all pot controls if it is an older receiver. I wouldn't apply DC voltage to the speaker, personally, If you get this far without success, then remove the mid and check inside wires going to speaker and use an olmmeter to check across mid terminals for resistance. Reinstall mid and make sure it seals good. I suspect it is your reciever/connections/wires from what you said, check those first. Peerless will be black with a small hole in middle, wires on front going down at 45 Degrees.
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  4. #4

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    Default

    Thanks for the quick replies. And Merry Christmas. OK I pushed on the passive and the Mid did move freely but it did sound like it was scraping a little. Yes my receiver is cooked on the left channel. But I did plug the speaker into the other speaker wires on the right side and it still sounded scratchy. I will take it apart and check the connections inside the speaker. That would be nice if all it is a bad connection. Is there a way to check the crossover or does that not even apply here?

  5. #5

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    Just use your 5 fingers spread evenly around the cone, gently push the cone in. If you hear scraping, you've got a bad driver, no need for all that other stuff. BTW, the SL1000 has the coiled wires running at 45 degrees too, but the face plate is silver.
    'Political Correctness'.........defined

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  6. #6

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    Yep. Looks like the driver is bad. I pushed on the other speaker passive and the mid moved freely and no noise. I then pushed on the bad mid gently and it scapes. Thanks for all the help so quickly. Now I need to buy a new driver and a new receiver. I am definately keeping the Polks but the Sansui will be replaced.

  7. #7

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    Default pic of peerless

    the beloved Peerless tweeter in 7B's :)
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    PolkFest 2012, who's going>?
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