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Ever see a kick drum with a passive radiator?

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  • Ever see a kick drum with a passive radiator?

    Ok, this I've never heard of before. I was watching Charlie Daniels Live at Billy Bob's (AXS TV) and notice that the two kick drums (Gretsch name hanging in front) have passive radiators rather than drum heads on the public facing side. These are almost the size of the drum diameter with a huge roll surround. I can't find one using google, either. But it must change the tuning and I suspect provide more output than a standard drum head which is itself a type of passive radiator. The difference I suspect is probably that it provides for more output since there's a surround rather than having the edge fixed as is the case for a normal drum head. The center section is clear, so it looks like there's no actual PR tuning, it appears to be primarily the large surround that is the goal. The head is not taut, not under any serious tension, so it's like having an open drum, but with the PR in place, there's no restriction to movement, but it may reduce other resonances the way a PR limits out-of-tuning radiation.

    There's little doubt, in his solo mid-show they show a closeup of one of them. Strangest contraption I've seen in a while. I'd really like to know how it affects the tuning.

    dlr
    WinPCD - Windows .NET Passive Crossover Designer

    Dave's Speaker Pages

  • #2
    I think it is called a kickport. Maybe.
    craigk

    " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

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    • #3
      I've seen passive drum setups on bass drums in front of the standard bass drum head... If I'm not mistaken, the drummer for Fleetwood Mac used that setup occasionally.
      ...But an actual speaker-type passive radiator in lieu of a drum membrane? Nope. Interesting though. It must provide a lower tuning being heavier all things being equal... how did the bass drum hits sound?

      TomZ
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      • #4
        You can see them in this clip around 25 seconds in:

        https://www.youtube.com/watch?v=h6Al20sgm4Y

        Like a lot of acoustic stuff that's done by musicians, it's probably coincidental if it actually improves the sound at all.

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        • #5
          http://www.guitarcenter.com/Kickport...nd-Enhancer.gc.
          craigk

          " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

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          • #6
            http://www.drummercafe.com/reviews/g...um-insert.html

            Or this could be it
            craigk

            " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

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            • #7
              It's definitely not a kick port. That is an actual port that is placed into the drum head. What I saw was a total replacement of the drum head. The surround was close to the diameter of the entire drum itself. You can see them starting at 25 sec. in the link provided by SPLEclipse as he pointed out.

              dlr
              WinPCD - Windows .NET Passive Crossover Designer

              Dave's Speaker Pages

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              • #8
                Originally posted by dlr View Post
                It's definitely not a kick port. That is an actual port that is placed into the drum head. What I saw was a total replacement of the drum head. The surround was close to the diameter of the entire drum itself. You can see them starting at 25 sec. in the link provided by SPLEclipse as he pointed out.

                dlr
                I think what you're seeing on the audience facing side of the drum is actually a printed picture, and there's a big port right in the middle. Makes it look like a giant sub. You can see writing on it at the top and it definitely wouldn't be over the surround without being distorted in appearance.
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                • #9
                  Originally posted by Pete Schumacher View Post
                  I think what you're seeing on the audience facing side of the drum is actually a printed picture.
                  +1. If you go to full screen with the video you can even see what appear to be driver mounting bolts on the 'frame'.
                  There's a better look at it here:
                  https://www.moderndrummer.com/articl...-pat-mcdonald/
                  What is different is that it appears there are short ducts on the holes the mics are pointed into. That would work like a bass reflex port, but to do so the front head would have to be rigid.
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                  • #10
                    At first I though you ment something like this: http://woggmusic.com/creating-a-woof...um-microphone/ But the video says otherwise. I agree that's likely a clever graphic on the resonant head. Sent from my SM-G920P using Tapatalk
                    Electronics engineer, woofer enthusiast, and musician.
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                    • #11
                      No, but I saw Bob Seger when he had this rig.

                      http://gloriousnoise.com/2010/bob_seger_system_photo

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                      • #12
                        Originally posted by SPLEclipse View Post
                        You can see them in this clip around 25 seconds in:

                        https://www.youtube.com/watch?v=h6Al20sgm4Y

                        Like a lot of acoustic stuff that's done by musicians, it's probably coincidental if it actually improves the sound at all.
                        That looks an awful lot like the front of the drum is just painted with the image of a speaker. You can see the Gretsch logo is painted flat on the speaker surround at the top of the drum.
                        Don't waste your money on a new set of speakers, you get more mileage from a cheap pair of sneakers. Next phase, new wave, dance craze, anyways it's still rock and roll to me!

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                        • #13
                          It's apparently a really good illusion.

                          dlr
                          WinPCD - Windows .NET Passive Crossover Designer

                          Dave's Speaker Pages

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                          • #14
                            Originally posted by djg View Post
                            No, but I saw Bob Seger when he had this rig.

                            http://gloriousnoise.com/2010/bob_seger_system_photo
                            I miss 1970.

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                            • #15
                              https://www.moderndrummer.com/articl...-pat-mcdonald/

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