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Tweeter Leaking Air

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  • #16
    Originally posted by turn2 View Post
    It appears from the pics that your tweeter is not flush mounted, and that your woofer laps over the flange of the tweeter. Is this correct?
    The tweeter is flush mounted. The mounting scheme is similar to that of Paul Carmody's Speedsters, where the tweeter is flush mounted and the woofer is surface mounted and slightly overlaps the tweeter flange. There would be a massive air gap if both drivers were surface mounted and overlapping, and that is not what I've done. I have foam gasket tape under the woofer flange that seals the intersection between the woofer and tweeter, and although this could be optimized further, it is not the primary source of the air leak.

    I ended up covering the entire back of both tweeters in silicone caulk and this solved the problem. Thanks for everyone's help. I will post pictures of the final solution including the tweeter treatment and foam gasket tape soon.

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    • #17
      Originally posted by AEIOU View Post

      Good observation, the overlap could well indeed be the source of his consternation. I find it very hard to believe that someone is incapable of finding and sealing a simple leak. The likelihood that the tweeter was defective is plausible, but highly unlikely.
      Yikes, that seemed a little aggressive.

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      • #18
        silly question, but are you by chance running the tweeter too low? What frequency is your HP filter? Seems implausible for chuffing like in the video if you have the back completely sealed.

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        • #19
          Originally posted by twelve-thousand-parrots View Post

          The tweeter is flush mounted. The mounting scheme is similar to that of Paul Carmody's Speedsters, where the tweeter is flush mounted and the woofer is surface mounted and slightly overlaps the tweeter flange. There would be a massive air gap if both drivers were surface mounted and overlapping, and that is not what I've done. I have foam gasket tape under the woofer flange that seals the intersection between the woofer and tweeter, and although this could be optimized further, it is not the primary source of the air leak.

          I ended up covering the entire back of both tweeters in silicone caulk and this solved the problem. Thanks for everyone's help. I will post pictures of the final solution including the tweeter treatment and foam gasket tape soon.
          Okay, maybe what I was seeing standing proud of the baffle was the mounting screw and not the rim of the tweeter. My bad. Carry on.

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          • #20
            FWIW...

            If this is a leaky tweeter it appears to be a one-off problem. Possibly a lack of glue between the plastic and metal frames on the tweeter itself. I do not see how air could get between the dome and plastic flange on these.

            I performed a test with two different sealed enclosures here in the lab, one with the drivers separated (not overlapped) and one mounted the way you show in the video. With random drivers pulled from stock I could not replicate a leak on either enclosure. I played 10-60 Hz tones at around 9 volts. It is also not a problem we have come across before, so this appears to be a random uncommon one-time issue.

            If something like this occurs I encourage you to contact our customer service first at 800-338-0531. If it is a defective product we are very good about getting it replaced quickly.
            Your results may vary.

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            • #21
              Originally posted by GTPlus View Post
              silly question, but are you by chance running the tweeter too low? What frequency is your HP filter? Seems implausible for chuffing like in the video if you have the back completely sealed.
              I'm crossing it at about 3 kHz, which is about double the tweeter's Fs, so that shouldn't be an issue. To be clear, the chuffing in the video was prior to sealing the back's with silicone. The chuffing is now all but inaudible.

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              • #22
                Originally posted by mattp View Post
                FWIW...

                If this is a leaky tweeter it appears to be a one-off problem. Possibly a lack of glue between the plastic and metal frames on the tweeter itself. I do not see how air could get between the dome and plastic flange on these.

                I performed a test with two different sealed enclosures here in the lab, one with the drivers separated (not overlapped) and one mounted the way you show in the video. With random drivers pulled from stock I could not replicate a leak on either enclosure. I played 10-60 Hz tones at around 9 volts. It is also not a problem we have come across before, so this appears to be a random uncommon one-time issue.

                If something like this occurs I encourage you to contact our customer service first at 800-338-0531. If it is a defective product we are very good about getting it replaced quickly.
                Matt, I appreciate your efforts to test this on your end. I agree that it's probably a one-off problem, and I've been very happy with everything else I've purchased from Dayton. I suspect this issue is process-related since both the tweeters I received exhibited this issue. I still haven't decided if I'm going to contact customer service since it may be more of a hassle and time sink than my current fix.

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