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Planning to build RS225 Duets Sealed

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  • Planning to build RS225 Duets Sealed

    I would like to build Paul K's duets but sealed. I was thinking of a 0.75 cu ft enclosure and keep the same baffle width and crossover. The sealed version would sit on top of a 12 " RS HF sub on each side. The sub enclosures are 14 inches wide and 32 inches high. Will this work without mod to the crossover?

  • #2
    Re: Planning to build RS225 Duets Sealed

    I suspect it will work without any crossover changes other than possibly BSC. I modeled your proposed sealed box with internal dimensions of 8.5" x 8.5" x 18" and attached the predicted response with the whole box stuffed at 0.5 lb/ft3 and the two drivers located just like they are on my build.
    Paul
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    Originally posted by kendomusic View Post
    I would like to build Paul K's duets but sealed. I was thinking of a 0.75 cu ft enclosure and keep the same baffle width and crossover. The sealed version would sit on top of a 12 " RS HF sub on each side. The sub enclosures are 14 inches wide and 32 inches high. Will this work without mod to the crossover?

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    • #3
      Re: Planning to build RS225 Duets Sealed

      So I built this TM(RS225/RS28F) sitting on a pair 12 " RS HF subs. The baffle is 14" x 14" with 45 degree facets, so the flat portion of the baffle is 10 inches. The depth of the box is 10 inches. I started the crossover using the values and slopes used in Paul K's Duet. Surpisingly, the crossover would work. However, since I already had a pair of 2.2 mH inductors available, I figured I could save a little bit if I modded the Duet crossover where it required a 2.5 mH on the woofer. The resulting crossover is not too far from the Duet but a few slight value changes on the woofer circuit capacitor and an inductor on the tweeter circuit. The resulting crossover point is now at 1500hz vs 1400hz on the Duet. Overall, I like the sound of the sealed TM. Something is different about the sound of an 8" woofer used as a mid but in a good way, I cant describe it though. Maybe it has more radiating surface. Plus the fact, I does not have to do much below 80 hz as the subwoofers take over.
      Attached Files

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      • #4
        Re: Planning to build RS225 Duets Sealed

        What did you use for C6?
        Wolf
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        • #5
          Re: Planning to build RS225 Duets Sealed

          The C6 value is 100uF.
          Thanks

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