Roundover on sealed design, will it make a difference?

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  • xyrium
    Senior Member
    • Nov 2009
    • 118

    Roundover on sealed design, will it make a difference?

    Hey guys,

    So, I've got the interior of the cabs, the soldering and mounting of the xovers, and the routing of the baffles complete for the ZRT design. However, when sorting through my tools, I was unable to locate my 1/2" collet for my 3/8" roundover bit. This said, since this is a SEALED version of the ZRT, will a roundover make any difference?

    Thanks,
    Paul
    Paul
  • cjd
    Ultra Senior Member
    • Dec 2004
    • 5568

    #2
    Sealed or anything else, yes. How much? Depends.
    diVine Sound - my DIY speaker designs at diVine Audio

    Comment

    • xyrium
      Senior Member
      • Nov 2009
      • 118

      #3
      This kills. Maybe I'll just take a rasp to it...
      Paul

      Comment

      • lunchmoney
        Senior Member
        • Jul 2008
        • 152

        #4
        yikes... that would be tough to do cleanly with a rasp

        take a deep breath, then go buy a new collet

        Comment

        • cjd
          Ultra Senior Member
          • Dec 2004
          • 5568

          #5
          3/8 is going to be minimal change - far less than the somewhat more common 3/4" roundover or a bezel, though not nonexistent. A little felt treatment around the tweeter will likely ameliorate any issues leaving it square. A ~3/8 bezel may have good results too (though again different), perhaps that's easier for you to accomplish?
          diVine Sound - my DIY speaker designs at diVine Audio

          Comment

          • ---k---
            Ultra Senior Member
            • Nov 2005
            • 5202

            #6
            Can you do a 45d chamfer on your table saw? If so, do a ~3/4" chamfer.
            - Ryan

            CJD Ochocinco! ND140/BC25SC06 MTM & TM
            CJD Khanspires - A Dayton RS28/RS150/RS225 WMTMW
            CJD Khancenter - A Dayton RS28/RS150/RS180 WTMW Center

            Comment

            • xyrium
              Senior Member
              • Nov 2009
              • 118

              #7
              Yeah, I ordered the collet just before I posted this thread. I suppose I'll just have to wait. I'd rather do it right than half a$$ it.

              I have several bits, but figured the 3/8 would least impact the structural integrity of the baffle. However, maybe I'll go that extra mile and try a 5/8 or 3/4. The drivers are fairly close in this design, so I figured the more meat I leave between them, the better isolation. I'm searching for the best compromise, so maybe a 1/2" roundover is it.

              I could get 45 on my table saw, but how am I going to get a 10" blade into a 6-3/16" circle? I'm actually doing a roundover on the interior of the baffle for the woofer cutout, not the edges of the baffle where it meets the side/top/bottom of the cabinet. I should have clarified that, sorry guys!

              Now I sit and wait for UPS...probably until next Tuesday or so. Don't buy a Hitachi router. Though I think the unit itself is actually quite good (KM12VC) it's impossible to get parts for, and forget accessories. I should have stuck with Bosch or Porter Cable....

              Thanks!
              Paul
              Paul

              Comment

              • BobEllis
                Super Senior Member
                • Dec 2005
                • 1609

                #8
                Ahh - you mean inside the woofer cutouts rather than the outside baffle edges.

                Actually you'd be better off with a chamfer than a roundover there. The idea is to give the woofer more room to breathe.

                Somebody, maybe Zaph but I cannot find a link, posted results of tests with or without the chamfer on some small drivers. Very worthwhile.

                Comment

                • cjd
                  Ultra Senior Member
                  • Dec 2004
                  • 5568

                  #9
                  Ahh snap.

                  I often use an ogee bit for driver relief. Or a 45 chamfer.
                  diVine Sound - my DIY speaker designs at diVine Audio

                  Comment

                  • ---k---
                    Ultra Senior Member
                    • Nov 2005
                    • 5202

                    #10
                    I've done a driver openings with a rasp. Worked okay. In some ways, better than a router. But the edge of a box I would stick with a router so that the box impresses people.
                    - Ryan

                    CJD Ochocinco! ND140/BC25SC06 MTM & TM
                    CJD Khanspires - A Dayton RS28/RS150/RS225 WMTMW
                    CJD Khancenter - A Dayton RS28/RS150/RS180 WTMW Center

                    Comment

                    • lunchmoney
                      Senior Member
                      • Jul 2008
                      • 152

                      #11
                      Ahh as well... I also thought you meant roundovers on the sides of the baffle...

                      How thick is your baffle? If it's 3/4" or less, it's probably not that big of a deal if you skip the inside chamfer.

                      Comment

                      • robfive
                        Junior Member
                        • Dec 2005
                        • 24

                        #12
                        Originally posted by xyrium
                        This kills. Maybe I'll just take a rasp to it...
                        Go to town with the rasp. It will work well.

                        Comment

                        • sdl2112
                          Senior Member
                          • Mar 2006
                          • 571

                          #13
                          Originally posted by BobEllis
                          Somebody, maybe Zaph but I cannot find a link, posted results of tests with or without the chamfer on some small drivers. Very worthwhile.
                          Maybe this from Troels?
                          The Importance of chamfering driver holes

                          Comment

                          • cjd
                            Ultra Senior Member
                            • Dec 2004
                            • 5568

                            #14
                            Zaph has published data on the importance of this as well. Don't neglect it. But yeah, for interior work, a rasp would have been adequate.
                            diVine Sound - my DIY speaker designs at diVine Audio

                            Comment

                            • xyrium
                              Senior Member
                              • Nov 2009
                              • 118

                              #15
                              Thanks guys. Once the collet arrives, maybe I'll do a chamfer. I'll have to check my bit collection, I think I might have something.

                              Edit: I have a 45 degree 5/8" chamfer bit. The baffle is 1" thick, but given the proximity of tweeter to woofer, I might stick with the 3/8 or 1/2" roundover though.
                              Last edited by xyrium; 31 December 2009, 16:42 Thursday.
                              Paul

                              Comment

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