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  1. #1

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    Default skematic of RTA 12C's???

    Yhought thete was one but cant find it! Checked polk vintage but no "c's", any help would help as to whare to look. Thanks in advance.
    Main Rig:
    Krell KAV 250a
    McIntosh MC 2120 bi-amped
    Into JBL L123 drivers
    Rane external crossover.
    MIT exp 1 ic's
    Perreaux SA33 class A preamp
    AQ kingcobra ic's
    ADCOM GDA 700 DAC ( MODDED)
    YAMMY CDC-665
    Marantz 6100 tt w/pickering XV-15/625E cart.
    Monster HTS 3600 power conditioner
    POLK RTA-12C'S W/ RDO194 TWEETS, clarity ESA caps mills risistors (full mod)
    MIT exps2 speaker cable

  2. #2

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    from what i know the b and c are the same cross overs. tweeters might be different and the caps might be different but the same values.

  3. #3

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    My RTA12C's had the same crossover as the RTA12B

  4. #4

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    Thanks i have found the B. Drawings that will help.
    Main Rig:
    Krell KAV 250a
    McIntosh MC 2120 bi-amped
    Into JBL L123 drivers
    Rane external crossover.
    MIT exp 1 ic's
    Perreaux SA33 class A preamp
    AQ kingcobra ic's
    ADCOM GDA 700 DAC ( MODDED)
    YAMMY CDC-665
    Marantz 6100 tt w/pickering XV-15/625E cart.
    Monster HTS 3600 power conditioner
    POLK RTA-12C'S W/ RDO194 TWEETS, clarity ESA caps mills risistors (full mod)
    MIT exps2 speaker cable

  5. #5

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    Quote Originally Posted by jon s View Post
    My RTA12C's had the same crossover as the RTA12B
    Same here. But . . . . . Definitely check the values printed on the crossover components. I would go by these if they differ from the schematics and are factory original.
    "Science is suppose to explain observations not dismiss them as impossible" - Norm on AA; 2.3TL's w/sonicaps/mills, polyswitches removed, Lg Solen inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR binding posts, upgraded IC Cable, Black Hole Damping Sheets (3" strips) installed on back wall behind MW's & Tweeters, interior of cabinets sealed, AI-1 interface with 1000VA transformer

  6. #6

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    One difference would be the fuse vs polyswitch for tweeter protection.

  7. #7

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    Quote Originally Posted by DaveHo View Post
    One difference would be the fuse vs polyswitch for tweeter protection.
    True, although my 12C's, which were purchased new by me in august of 1984, have fuses (C's are supposed to have polyswitches). I plan on replacing these with resistors at some point as I use a clean high power amp to drive them, and I've never blown a fuse or a tweeter despite some very high spl's.

    The schmatics are no doubt useful, but you still gotta look and see what Polk used to build the Xovers.
    "Science is suppose to explain observations not dismiss them as impossible" - Norm on AA; 2.3TL's w/sonicaps/mills, polyswitches removed, Lg Solen inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR binding posts, upgraded IC Cable, Black Hole Damping Sheets (3" strips) installed on back wall behind MW's & Tweeters, interior of cabinets sealed, AI-1 interface with 1000VA transformer

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