skematic of RTA 12C's???

soundfreak1
soundfreak1 Posts: 3,414
edited April 2013 in Vintage Speakers
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 biamped to mid/highs
Parasound HCA1500A biamped to lows
Nakamichi EC100 Active xover
MIT exp 1 ic's
Perreaux SA33 class A preamp
AQ kingcobra ic's
OPPO 83 CDP
Lehmann audio black cube SE phono pre, Audioquest phono wire (ITA1/1)
Denon DP-1200 TT. AToc9ML MC cart.
Monster HTS 3600 power conditioner
ADS L1590/2 Biamped
MIT exps2 speaker cable
Post edited by soundfreak1 on
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  • EricFromMich
    EricFromMich Posts: 38
    edited April 2013
    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.
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  • jon s
    jon s Posts: 905
    edited April 2013
    My RTA12C's had the same crossover as the RTA12B
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  • soundfreak1
    soundfreak1 Posts: 3,414
    edited April 2013
    Thanks i have found the B. Drawings that will help.
    Main Rig:
    Krell KAV 250a biamped to mid/highs
    Parasound HCA1500A biamped to lows
    Nakamichi EC100 Active xover
    MIT exp 1 ic's
    Perreaux SA33 class A preamp
    AQ kingcobra ic's
    OPPO 83 CDP
    Lehmann audio black cube SE phono pre, Audioquest phono wire (ITA1/1)
    Denon DP-1200 TT. AToc9ML MC cart.
    Monster HTS 3600 power conditioner
    ADS L1590/2 Biamped
    MIT exps2 speaker cable
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  • drumminman
    drumminman Posts: 3,396
    edited April 2013
    jon s wrote: »
    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/jantzen inductors, Gimpod's boards, Lg Solen SDA inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR BP's, upgraded IC Cable, Black Hole Damping Sheet strips, interior of cabinets sealed with Loctite Power Grab, AI-1 interface with 1000VA A-L transformer
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  • DaveHo
    DaveHo Posts: 3,529
    edited April 2013
    One difference would be the fuse vs polyswitch for tweeter protection.
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  • drumminman
    drumminman Posts: 3,396
    edited April 2013
    DaveHo wrote: »
    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/jantzen inductors, Gimpod's boards, Lg Solen SDA inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR BP's, upgraded IC Cable, Black Hole Damping Sheet strips, interior of cabinets sealed with Loctite Power Grab, AI-1 interface with 1000VA A-L transformer
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