I have been wondering if anyone has ever tried using the newer midwoofers with the SDA's?

honestaquarianhonestaquarian Posts: 2,830
edited February 2019 in Vintage Speakers
Has anyone ever tried using any of the newer Dynamic Balance 6.5 inch midwoofers in any of the SDA's?
Particularly the SRS series.
If so, how did it work out?
Good?
Bad?
Did you hear any differences?

Answers

  • VR3VR3 Posts: 23,870
    edited February 2019
    Wouldn't try it personally, I know @ben62670 built a franken sda Polk with newer drivers, he is no longer here with us (RIP), but I heard there was mild success.
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • @VR3 can you expand on that please?
    Why wouldn't you do it?
    What does "mild success" mean?
    I have been curious about this for quite sometime, but i'm a geek and while good with my hands and good at figuring stuff out (and then quickly forgetting how I figured it out). I'm nowhere near the level that you are at when it comes to this stuff.
  • VR3VR3 Posts: 23,870
    You would literally have to redesign everything, from the enclosures to the crossovers... the parameters are most likely no where close
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • honestaquarianhonestaquarian Posts: 2,830
    edited February 2019
    Wow so you couldn't just get some newer midwoofers and drop them in place huh?
    Thanks @VR3 :)
  • High performance loudspeaker design is not a trivial matter. The size, shape, and materials of the enclosure, quality and electrical parameters of the crossover components, and quality and electrical parameters of the drivers and tweeters must all be taken into consideration.

    Speakers are an extension of the crossover. Accordingly, the electrical parameters of the crossover and speakers must be compatible. This is particularly true with regard to driver impedance (which changes with frequency).

    Simply dropping in the same size driver or tweeter as the original may "work" and it may even "sound good", but it won't provide optimal performance and you may end up with a speaker load that presents a dangerous impedance level at some frequency or, at the very least, sonic imbalances at some frequencies.

    "So hot it burns Mice!"~DK
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
    "Knowledge, without understanding, is a path to failure."~DK
    "Those who irrationally rail against something or someone that is no threat to them, actually desire (or desire to be like) the thing or person they are railing against."~DK
  • honestaquarianhonestaquarian Posts: 2,830
    edited February 2019
    Thanks @DarqueKnight
    I have wondered for many years what the regular SDA's would have sounded like had they still been making them when the the Dynamic Balance drivers appeared.
    I guess the only ones which have them are the SRT's, but that is a very different animal!
    Now that were talking about it I am beginning to remember what the SRT's sounded like with music when driven with some Proceed electronics (remember THEM?)
    One of THE BEST musical and SDA experiences I have ever had!!
    I think that is why I have wondered for so long what the older SDA's would sound like with the Dynamic Balance drivers.
  • westmassguywestmassguy Posts: 6,647
    We don't have complete T/S parameters for the vintage drivers, never mind the new Dynamic Balance models. Most of the folks that worked on the SDAs are no longer with us, or no longer with Polk. It would be shear luck finding compatible replacements from the newer Polk woofers. A shot in the dark, that could end up being a very expensive mistake in the end. Why fix what isn't broken?
    There's nothing inherently wrong with coated paper cones.
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  • F1nutF1nut Posts: 44,695
    VR3 wrote: »
    Wouldn't try it personally, I know @ben62670 built a franken sda Polk with newer drivers, he is no longer here with us (RIP), but I heard there was mild success.

    Correction, they were a disaster and eventually dismantled.
    Political Correctness'.........defined

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