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Dayton RS28a-8; Did this exist?

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  • Dayton RS28a-8; Did this exist?

    Hello Audio Experts!

    I've been looking at the Mark K. RS28a/RS225 MT design, and it looks to have an 8ohm rs28a aluminum tweet, not the 4ohm version I see sold now.
    Did an 8ohm version exist, and is this what Mark K. used?

    http://www.htguide.com/forum/showthr...RS28a-RS225-MT

    TIA! Murf



  • #2
    The "original" RS domes did not have the "a" suffix.
    They were both 4 ohms (AFAICT), a soft dome and an Al dome. Their replacements typically are not "drop in" (from what others have said).
    What makes you think Mark used an 8 ohm tweeter?

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    • #3
      They might've used to sell a shielded version with different specs, but I'm not seeing any old/NA pages for an 8ohm version for any of the RS28's. Might simply be my googling ability isn't strong enough though.

      EDIT: I didn't notice anything in that thread suggesting an 8ohm version. Can you highlight/quote what you read that seemed to suggest it?...I'm guessing on second look it might be a small misunderstanding from something else getting referenced.
      My first 2way build

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      • #4
        Thanks Folks,

        The reason I was wondering about the ohms is because of lack of info. The Woof is 8ohms, and I thought convention was most drivers are 8ohms unless noted.
        I did a bunch of googling, and I only see the RS28 4ohm for sale. I have found a few references to the Mark K. RS28a/RS225 MTdesign, but have not seen the ohms for the tweet given, so just askin'!
        If the drivers for this design are still available, I think they may fit into the Infinity Reference 2 cabs I got free (bad woof surround). These would be for a smaller system, up in a cabin in the woods, not for my home system, which has big 3-ways with x-overs done by R-Carpenter.
        So be afraid; I might have to ask more questions.... (yes, I'm a "novice").

        Murf

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        • #5
          The tweeter in Mark's design was definitely a 4-ohm driver. He updated that design for me but using the RS28F-4 along with the RS225-8 (non-shielded version) for my RS duets floor-stander ML-TL.
          Paul

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          • #6
            Thanks Paul,

            I found a design update using the RS28a from 2008 (?), which I think is the one still sold.

            Murf

            Comment


            • #7
              This thread is from 2017. 2008 seems way before the old RS28s were discontinued.

              https://diy.midwestaudio.club/discus...se-of-the-rs28

              Comment


              • #8
                The current RST28A is not the old RS28A. That is for certain.

                Later,
                Wolf
                "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                *InDIYana event website*

                Photobucket pages:
                http://photobucket.com/Wolf-Speakers_and_more

                My blog/writeups/thoughts here at PE:
                http://techtalk.parts-express.com/blog.php?u=4102

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                • #9
                  Hi Wolf,

                  PE has an "RS28a", not an RST...
                  What do you think, pls?

                  https://www.parts-express.com/dayton...eeter--275-130

                  Murf

                  Comment


                  • djg
                    djg commented
                    Editing a comment
                    No longer available.

                    Comparable items in stock: RST28A-4

                    Comparable, not identical, not a drop in replacement.

                • #10
                  That linked page clearly says, "This product is no longer available".
                  Paul

                  Originally posted by littlebear View Post
                  Hi Wolf,

                  PE has an "RS28a", not an RST...
                  What do you think, pls?

                  https://www.parts-express.com/dayton...eeter--275-130

                  Murf

                  Comment


                  • #11
                    The original tweeter was the RS28A and was 4 ohm. They later came out with the RS28F. Both were 4 ohm.

                    Comment


                    • #12
                      Oops, sorry about that little availability problem! I see Meniscus also has them, but listed as "out of stock"
                      So much for my "easy" speaker plan... I doubt if there is another 8" two-way design that could use my cabs!
                      But the page DJG linked to is good, and should help me going forward.

                      http://www.htguide.com/forum/showthr...t-to-build-now


                      Murf

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                      • #13
                        How big ARE your cabs?

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                        • #14
                          They are Infinity Reference 2 8-inch 2-way cabs, sealed box. Outside 10.5w x 9.5d x 18.25"h. Walls 1/2" thick (actual), baffle .75", no internal bracing, tweet flange ~3.75" diameter; maybe ~.75cuft interior volume without drivers, I think. Sort-of rounded baffle edges.
                          A pretty heavy cab with a sort of light woof, and opinion on the innernet says the tweets can be a little fatiguing.

                          Murf
                          Last edited by littlebear; 10-16-2020, 12:53 PM.

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                          • #15
                            Wolf's Zingers would fit. Probably want to beef up the cab. 8" 2way with Dayton DVC subwoofer. Simple but innovative. Truly full range.

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