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Wondering if a Classic 2.5 clone can be made with a series crossover on the woofers

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  • Wondering if a Classic 2.5 clone can be made with a series crossover on the woofers

    Hi,
    I have some DC160 -4 woofers and DC28F-8 tweeters. I am inquiring if it would be possible to use the 2 woofers in series for an 8 ohm system in the Paul Carmody Classic 2.5 TMM enclosure. I know I can make an MTM, but would rather have a TMM. Thanks for your time.

    Myles

  • #2
    Originally posted by Kootskid View Post
    Hi,
    I have some DC160 -4 woofers and DC28F-8 tweeters. I am inquiring if it would be possible to use the 2 woofers in series for an 8 ohm system in the Paul Carmody Classic 2.5 TMM enclosure. I know I can make an MTM, but would rather have a TMM. Thanks for your time.

    Myles
    It won't be a 'clone' as you're using different drivers, in particular, the tweeter's different. What I think you're after is a TMM/2.5 way crossover for those drivers, with the bottom woofer providing the Baffle Step Compensation as per the Classix 2.5 design. This will mean a new XO.

    Enclosure-wise, without modelling I think the Classix 2.5 cabinet could be OK as the 160-4s and 160-8s have similar parameters.

    There are a few designs around for a DC160-8 and DC28F MTM, but none that I've found for the 160-4 and no TMM 2.5 projects; happy to be proved wrong of course. The 2.5 feature adds additional fun/issues to deal with in working out a crossover.

    Sorry I can't be more help but other PETT members may have some suggestions for you.

    Geoff
    Last edited by Geoff Millar; 09-14-2020, 08:04 AM. Reason: typos

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    • #3
      Don't know, but don't THINK you can get to a 2.5-way using a pair of 4ohmers in series. I think a ".5" necessitates that the woofers be (wired/filtered) in parallel. (Wolf prob. knows the answer to this - perhaps he'll pop in?)

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      • #4
        Thanks for the help so far. I have looked in with Curt Campbell in regards to building a larger version of his TriTrix. If Curts MTM model is what I build, I will have to decide on whether I want to build the TL's or the smaller version. Let's see if Wolf chimes in.

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        • #5
          Originally posted by Chris Roemer View Post
          Don't know, but don't THINK you can get to a 2.5-way using a pair of 4ohmers in series. I think a ".5" necessitates that the woofers be (wired/filtered) in parallel. (Wolf prob. knows the answer to this - perhaps he'll pop in?)
          That's certainly the case with the Classix 2.5 and one other project I've seen somewhere.

          An MTM with the DC160-4 and DC28F could be modelled - I could try it in Xsim if you wish - by adapting an existing design for a DC160-8/DC28 two way.

          This might be tricky: the DC160-4 - using the factory supplied data in Xsim, shown below - has a rougher FR than the 8 ohm version, so the XO will need an expert touch. Not mine!

          The red is the DC160-4; connecting two in series will obviously affect the FRD and ZMA graphs.

          Geoff
          Click image for larger version

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          • #6
            Thanks for the preliminary sim, Geoff. Not sure what my next move should or could be with these 4 ohm woofers. I may get a hold of Curt and see what recommendations he can give me on a larger model of the TriTrix, as it has woofers wired in series

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