SDA II replacement driver questions

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Hello, I recently decided to buy a friends pair of SDA II speakers that he bought in college. He bought them used a couple years old, 30 years ago. I am very familiar with them, as I have been in close contact with him this whole time. They are second generation 2's (horizontal tweeters, 3 6.5 drivers per speaker, no protection fuse on the back).

Anyway, one driver is locked up. He had one driver replaced after maybe 3 or 4 years of owning them, but this is a different one. All drivers are MW 6501's, including the one replaced, but the replacement has a later date on it than the others.

I have ordered a pair of MW 6503's to replace the bad driver, but I'm wondering what the best configuration would be? Basically I have a pair of speakers that need 6 drivers, and what I have are four "matched" 6501's with presumably the same amount of wear/mileage on them, 2 replacement 6503's which I believe are New Old Stock, and one newer 6501.

So, given that assortment of 7 drivers, what would you put where? I understand the 6501 and 6503 have slightly different specs, so the 6503's should probably be used in the same spot on each speaker, but is there a better place to put them (bass, mid, or dimensional driver), or does it not matter?

Thanks for any input.

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  • F1nut
    F1nut Posts: 49,802
    edited April 2017
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    The 6510 is closer to the 6501 than the 6503.

    Regardless, put the two oddball drivers in the SDA position.
    Political Correctness'.........defined

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  • Toeslider
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    Are the SDA drivers always toward the outside? Or where are they on the 2's with three drivers?
  • F1nut
    F1nut Posts: 49,802
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    Always on the outside.
    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