Sda srs 1.2 reversed polarity?!

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  • pitdogg2
    pitdogg2 Posts: 25,574
    There is a very good reason Polk went from all mw6503 in the original SDA SRS to half mw6503 and half mw6511 in the SRS 1.2/1.2tl.
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  • SeleniumFalcon
    SeleniumFalcon Posts: 3,835
    edited November 27
    If a 3.0 ohm resistor was paralleled with the 6.54 ohm driver you would have 3.13 ohm DC resistance.
    Post edited by SeleniumFalcon on
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  • GreggyG
    GreggyG Posts: 35
    Gardenstater wrote: »
    You would barely hear any SDA because the DC resistance of the MW6503 is 6.54 Ohms vs. 3.130 Ohms for the proper MW6511s. Compliance is close and BL slightly more, but not enough to make it work properly and you would barely hear them.

    Interesting, thank you. So the outside ones are the 6511 I think then, right? And you are saying that I should not/never replace those with 6503 if/when the time comes because it wouldn't do much of anything given the ohm load is different and therefore minimal output?
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  • F1nut
    F1nut Posts: 50,654
    The 6502 is closer to the 6511, so it could make do in a pinch, but is not a permanent replacement.
    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 t-u-r-d by the clean end."

    President of Club Polk

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  • decato
    decato Posts: 188
    edited November 29
    Hi all,
    I just noticed this thread. Are there remaining questions about the levels of the tweeters?
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  • Gardenstater
    Gardenstater Posts: 4,502
    decato wrote: »
    Hi all,
    I just noticed this thread. Are there remaining questions about the levels of the tweeters?

    Hi, so the loudest tweeter T3 is the third tweeter from the top, ie. second tweeter from the floor?
    George / NJ

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  • decato
    decato Posts: 188
    edited November 29
    Gardenstater wrote: »
    Hi, so the loudest tweeter T3 is the third tweeter from the top, ie. second tweeter from the floor?

    Yes, T3, third from the top, should be the loudest. If it is not, can you verify T3 is not blown or damaged by swapping it with T4.

    Tweeters T1, T2, and T4 are in series with a resistor, so their levels are attenuated.
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