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  1. #1

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    Default RTA 11TL High Passive Radiator "crackle"

    First Post! I picked up a pair of RTA-11TL speakers (minty...or so I thought) in May.

    I had noticed in casual listening, that I would get an occasional "crackle" from one side. Being a positive sort, I figured it was due to questionable power, or numerous other low end amp issues (I have a fairly low rent sony reciever I use to push these while I build a 2 channel system to truly push them properly.)

    Today, since I was inspired:

    1. Made a sweep tone CD.
    2. Determined the problem exists just in one speaker (after switching cabs to make sure the problem did not exist in the amp...and the second speaker performs fine on the same amp channel with the same source material.)
    3. Problem APPEARS to be isolated to the mid passive radiator (with the small cap)
    4. Noticed the passive radiator was slightly "crunchy" pushing it in.
    5. Pulled speaker. Ran sine tone again. No additional weirdness. (though wacky sounding without the speaker in the cab.)

    Thoughts to trouble shoot further? Source for new passive radiator? Go Fish?

    Thanks!

  2. #2

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    weird I always that the passive radiator would outlast the speaker !
    I see the radiators on ebay about once a month .

  3. #3

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    Welcome to club Polk.

    The PR's have a spider spring that has a cloth covering like a regular speaker. I have seen some Mid-woofers where this cloth detached from the basket and will make noise. This could happen to the PR's too. Fortunately, it can be re-glued to the basket.

    Another possibility is that some foreign object found its way into the back end of the PR.

    Stan
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade)
    Parasound: C/PT-600, HCA-800II; Denon: DVD-2910, DRM-800A; Monster HTS3600-MKII, Grado SR-225i

    HT:
    Denon AVR-888, Polk: RM7, PSW10, Marantz UD5005, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, DRA-825R, DCD-660, DRM-700A, DRR-780; Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S8, Monitor 5A, TSi100; Pioneer CT-6R, PL-530; Onkyo CP-1046F; Ortofon OM5E, Marantz PM5004, CD5004

  4. #4

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    You probably just need to push it with an amp with more NADs...

    Another possibility is that the gasket on that passive failed and allowed the factory installed blue smoke to escape... New gaskets will run you about $9.95.

    In all seriousness - welcome to the forum
    Last edited by ambiophonics; 07-23-2012 at 12:01 AM. Reason: lame

  5. #5

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    The PR's have a spider spring that has a cloth covering like a regular speaker. I have seen some Mid-woofers where this cloth detached from the basket and will make noise. This could happen to the PR's too. Fortunately, it can be re-glued to the basket.
    That's exactly what the problem is.
    '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 turd by the clean end."

  6. #6

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    Quote Originally Posted by skrol View Post
    Another possibility is that some foreign object found its way into the back end of the PR.

    Stan
    That is what I was thinking....some dead mice bones are 'crinkling' in there..LOL
    Course maybe they are stuffed with $100 bills :)

  7. #7

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    Quote Originally Posted by 20hz View Post
    weird I always that the passive radiator would outlast the speaker !
    I see the radiators on ebay about once a month .
    Success! Nabbed one for 25 shipped. Will hope that solves the issue, and attempt to repair the other for a spare if things go well!

  8. #8

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    Update: New PR arrived. Installed. Still crackles.
    Changed power source to Carver Cube. Still crackles (though sounds MUCH better than the stock NAD 7150 power amp.)

    Installed "defective" PR into speaker into other speaker: No crackle. (Very interesting.)
    Installed working PR into original speaker: Crackles. (doh!)

    Any more thoughts? The crackle kicks in at the low end of the range (I would suspect 45-50 hz) at all volume levels.

    -BlueSmoke

  9. #9

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    Check the rest of your cabinet for leaks.
    "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

  10. #10

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    Quote Originally Posted by Face View Post
    Check the rest of your cabinet for leaks.
    Good idea.

    Another thought, it's not the PR you are hearing, but rather the mid-driver.
    '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 turd by the clean end."

  11. #11

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    Are you sure there's nothing touching the back of the passive or mid-woofers? Speaker wire, batting, etc.

  12. #12

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    Quote Originally Posted by DaveHo View Post
    Are you sure there's nothing touching the back of the passive or mid-woofers? Speaker wire, batting, etc.
    Very good point.
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade)
    Parasound: C/PT-600, HCA-800II; Denon: DVD-2910, DRM-800A; Monster HTS3600-MKII, Grado SR-225i

    HT:
    Denon AVR-888, Polk: RM7, PSW10, Marantz UD5005, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, DRA-825R, DCD-660, DRM-700A, DRR-780; Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S8, Monitor 5A, TSi100; Pioneer CT-6R, PL-530; Onkyo CP-1046F; Ortofon OM5E, Marantz PM5004, CD5004

  13. #13

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    Ok: rattles exorcized.

    Switched original PR's back into speakers. Pulled the lower mid driver on the offending cab. Re-glued seals on back of speaker (as they tore when removing the speaker.) Rotated driver 90 degrees. Reinstalled.

    Noise GONE. Some wires must have been rattling against things.

    Anyone need a spare PR?

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