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  • Do these match?

    I am wondering how you fellow Techtalkies feel about pairing up a HiVI Rt1.3

    http://www.parts-express.com/pe/show...number=297-412

    with a TB W4-1757SB.

    http://www.parts-express.com/pe/show...number=264-881

    How do you think this pair would match up? Any and all commonest are welcome.


    By the way, my plans are to use these as the top end of a three way tower speaker with dual 8" woofers crossed around 200 Hz.

  • #2
    Re: Do these match?

    mid is 86db 1w1m, the tweeter is 92 db 2.83v1m. do you really want to use that mid? what woofers are you thinking about?
    " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

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    • #3
      Re: Do these match?

      The tweeter would obviously need to be padded down. as for the woofers. They are some no name buyouts PE had two years ago. They measure almost exactly the same as the dayton classic 8" which I also have.

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      • #4
        Re: Do these match?

        The tweeter listed goes down to 2500Hz? How well will the driver perform at this freq. or higher??? Maybe look for something else in a woofer:o

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        • #5
          Re: Do these match?

          Yeah, so the mid is 86dB. That's pretty normal for a 4" driver, and maybe even a little above average. It's not uncommon to pad a tweeter down to match a woofer.

          What's much more important is that their range overlaps fairly widely, so you can choose a crossover point between 3500 and 4000 Hz and not over-tax the ribbon tweeter (which can distort pretty horribly when crossed over low, sounding edgy and etched) and not push the midbass into breakup (which results in ringy, fatiguing midrange). With a ribbon tweeter, you want to consider a higher-order electrical filter (3rd or 4th-order) about an octave above the low end of the driver's frequency response.

          With the right woofer doing bass duties, you'd have a great set of drivers for a 3-way. Somebody might even be kind enough to model a crossover for you. (Don't you even THINK about an off-the-shelf crossover.) Maybe you could use this woofer: Usher 8137A Kevlar/Carbon Fiber 8". If a separate woofer wasn't in your plans, then yes, you might want to look at a different midbass, like the Peerless HDS Exclusive 6.5", keeping things in the same price range.
          Best Regards,

          Rory Buszka

          Taterworks Audio

          "The work of the individual still remains the spark which moves mankind ahead, even more than teamwork." - Igor I. Sikorsky

          If it works, but you don't know why it works, then you haven't done any engineering.

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          • #6
            Re: Do these match?

            Originally posted by vanapplebomb View Post
            I am wondering how you fellow Techtalkies feel about pairing up a HiVI Rt1.3

            http://www.parts-express.com/pe/show...number=297-412

            with a TB W4-1757SB.

            http://www.parts-express.com/pe/show...number=264-881

            How do you think this pair would match up? Any and all commonest are welcome.


            By the way, my plans are to use these as the top end of a three way tower speaker with dual 8" woofers crossed around 200 Hz.
            No reason those couldn't be made to work together. The mid, being a metal cone, is likely to have breakup issues around 10KHz or higher, so care must be taken to notch those frequencies out.

            And with a mid that small, I'd push the XO point up to 400Hz and let the woofer handle all the baffle step compensation duties.
            R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
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            • #7
              Re: Do these match?

              Being that Curt used it in his Mavericks, I feel it could be a viable solution.

              The thing is, there is an energy storage blip about 2.1 kHz in the impedance, and the HD (for those looking at it at Zaph's site) has a spike in the same area. Curt used it off-axis in the Q-TP design, so it was less of an effect.

              Personally, I've T/S-Z tested the W4-1805, W3-1797, W4-1798S, and all of them have an 'issue' that is very audible on-axis. You will either need to notch it a tad to allow for flatter and less fatiguing response, or use a robust tweeter to get below it.

              The RT1.3 I feel is a very nice planar, and it likes to be happy above 2.7-2.8 kHz LR4 or higher. I do feel the types of drivers will complement each other, so you should be good to go there.

              For the woofers- You have a high-res set of MT's pending, and shouldn't you get woofers that match better? I know it's your call, but the bass you get may be muddy by comparison to match the drivers up top.

              Later,
              Wolf
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              • #8
                Re: Do these match?

                I got a pair of 8" no-names from PE a few years back, they had a cover ring and a flat/inverted dust cover. I used them in a 3.5 way ported and they work well 800hz down. They would be a good match to your tweeter/mid pick.
                Ed
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