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Next project: 3-way with open baffle

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  • #16
    Re: Next project: 3-way with open baffle

    Originally posted by rpb View Post
    Why do you place the resistor in front of the x-over? It will change other values needed, but I'd put a resistor in series, and one across the terminals.
    It's just another way to help shape the tweeter response/level. A series resistor before the filter is easy to simulate in PCD, and I've found that sometimes it helps eliminate the need for an Lpad.

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    • #17
      Re: Next project: 3-way with open baffle

      Wow Phil, barely enough time to catch your breath from the Gila Monsters and you're tackling another design. It looks like this one could be even more challenging. Can't wait to see how it turns out.
      Tritrix HT:http://techtalk.parts-express.com/sh...d.php?t=222519
      Dayton 12" Subwoofer: http://techtalk.parts-express.com/sh...d.php?t=222930
      Overnight Sensations: http://techtalk.parts-express.com/sh...d.php?t=223751
      Cerberus sub: http://techtalk.parts-express.com/sh...hlight=cerebus
      Duellatis: http://techtalk.parts-express.com/sh...d.php?t=224943
      NTN's: http://techtalk.parts-express.com/sh...d.php?t=227902

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      • #18
        Re: Next project: 3-way with open baffle

        Originally posted by Soundslike View Post
        It looks like this one could be even more challenging..
        Yep, it's a 3-way design, so it'll be a challenge!

        On the other hand, I can't help but think that other aspects of this project will be less complicated, due to the fact that the woofer can be dealt with separately from the mid/tweeter. The woofer will just be in a simple box, with a simple 2nd-order LP filter. Once that's taken care of, the prototyping could begin by grabbing a random piece of pine 1x8 out of the scrap pile and mounting the mid and tweeter on it. Adjusting driver offsets and alignments and acoustic centers suddenly became really easy And, when one baffle turns out to be a dud, I can grab another scrap and try another alignment. (All of this would be informed and guided by the simulations I've already done in PCD.)

        It just occurred to me just now that this isn't *that* much different from a typical subwoofer and satellite design. What my idea has more or less turned out to be is much like what you would have if you had a subwoofer on each channel, crossed really high (~600 Hz), to a small box-less TM satellite.

        Aesthetically, I'm thinking of finishing the bass bins in black, and using a really nice light-colored hardwood (e.g., quilted maple) for the TM baffles. That would look sharp! I won't have access to my tools for awhile, though, so actually making some sawdust on these will have to wait until later this summer :(
        Attached Files

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        • #19
          Re: Next project: 3-way with open baffle

          Originally posted by 50 watt head View Post
          Yep, it's a 3-way design, so it'll be a challenge!

          On the other hand, I can't help but think that other aspects of this project will be less complicated, due to the fact that the woofer can be dealt with separately from the mid/tweeter. The woofer will just be in a simple box, with a simple 2nd-order LP filter. Once that's taken care of, the prototyping could begin by grabbing a random piece of pine 1x8 out of the scrap pile and mounting the mid and tweeter on it. Adjusting driver offsets and alignments and acoustic centers suddenly became really easy And, when one baffle turns out to be a dud, I can grab another scrap and try another alignment. (All of this would be informed and guided by the simulations I've already done in PCD.)

          It just occurred to me just now that this isn't *that* much different from a typical subwoofer and satellite design. What my idea has more or less turned out to be is much like what you would have if you had a subwoofer on each channel, crossed really high (~600 Hz), to a small box-less TM satellite.

          Aesthetically, I'm thinking of finishing the bass bins in black, and using a really nice light-colored hardwood (e.g., quilted maple) for the TM baffles. That would look sharp! I won't have access to my tools for awhile, though, so actually making some sawdust on these will have to wait until later this summer :(
          One suggestion . . . offset both mid and tweet on the baffle, and keep them aligned vertically. The 2" mid will benefit from the baffle offset, just like the tweet.
          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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          • #20
            Re: Next project: 3-way with open baffle

            One suggestion . . . offset both mid and tweet on the baffle, and keep them aligned vertically. The 2" mid will benefit from the baffle offset, just like the tweet.
            Will do -- thanks!

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            • #21
              Re: Next project: 3-way with open baffle

              Originally posted by 50 watt head View Post
              It's just another way to help shape the tweeter response/level. A series resistor before the filter is easy to simulate in PCD, and I've found that sometimes it helps eliminate the need for an Lpad.
              The L-pad may make it easier to shape the lower end of the midrange response. I don't like a sharp knee in a response.

              Comment

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