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Tweeter project: PE vifas in OEM pods

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    Tweeter project: PE vifas in OEM pods

    "Sometimes the only purpose of your life is to serve as a warning to others"

    So I thought it appropriate to share.

    In my never-ending quest to always do things the cheapest, hardest way possible, I decided to "improve" on the millions BMW spent developing their premium speakers, by buying closeout components from mail order houses.

    In the interest of sanity, don't stop to ask why. I didn't, and here we are.

    Step one was picking up a set of cheap 6" (5.25 really) woofers from parts express that don't come anywhere near the frequency cutoff of the factory tweeters.



    Step two was to find a set of tweeters that would cover the oops of the woofers without spending more money than a reputable set of car speakers would cost. I settled on a set of $9 vifas:





    I took a pair of factory pods with broken speakers and using advice from the forum, I gently pried away at the old tweeters until they worked free.
    Immediately there was a problem.



    Seems the speaker pod is a 4 piece affair: Pod, speaker, mounting ring and grill. One speaker came out alone, the other brought the mounting ring out with it and refuses to this day to let go of it. So, I have one pod with a mounting ring and one without. I figured I would deal with the difference in depth on the speaker mount.

    The vifas are bare tweeters, no mounting holes or protection, so I needed to come up with a way to mount them in the oem pods. I found a pvc reducer fitting in the electrical section at Lowes that has a 2" OD, a 1.5" inside diameter, and a 1.25 inch opening at one end. Looks like this:




    It holds the vifa perfectly, and the recess on the reducing end is just deep enough to protect the dome. I had to sand down the OD a bit as the pods are just under 2" ID, and cut the excess off the back. I also sanded down the reducing opening to make the edge softer. To cope with the mounting ring, I shaved 1/8" off the face of one with a power miter saw to compensate for the depth difference. To do this I attached the reducer fitting to a much larger piece of PVC tube (Be very, very, careful with the power miter, unless you find having a nickname like "Three fingers" appealing). It took much less sanding of the OD to fit than the side without the mounting ring. A dremel with a sanding disk makes trimming the OD pretty painless - I used a razor and sandpaper.

    A quick coat of paint and they are ready:





    The tweeters drop in like they were made to:



    and test mounted in the pods:



    This is the pod without the mounting ring




    Now I just need to hot glue it all together and give it a test drive

    Last edited by 318Joe; 02-27-2010, 02:57 PM.

    #2
    Aren't you guys afraid of using hot glue, you know, in a car, where it, ummm, get's really hot? I'd think anything you put together with hot glue will sag and separate over time.
    Originally posted by Matt-B
    hey does anyone know anyone who gets upset and makes electronics?

    Comment


      #3
      Holy shit.

      Looks like it is at least gonna sound good, right?

      "Zap" glue is your friend.

      Closing SOON!
      "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

      Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

      Thanks for 10 years of fun!

      Comment


        #4
        Originally posted by george graves View Post
        Aren't you guys afraid of using hot glue, you know, in a car, where it, ummm, get's really hot? I'd think anything you put together with hot glue will sag and separate over time.
        Ahhh, hadn't thought that far out yet. Thanks

        Comment


          #5
          Originally posted by StereoInstaller1 View Post
          Holy shit.

          Looks like it is at least gonna sound good, right?

          "Zap" glue is your friend.
          Heh. I hope they sound good. I am out on a limb, here.

          Zap glue, eh? Is that like goop or rtv?

          Comment


            #6
            No, Zap is a brand of crazy glue, but you use it with a spray accelerator.

            I buy it at hobby shops. Personally, I like the "thick, gap filling" type, it kicks ass and is slightly slower than normal crazy glue, but when used with the accelerant it is immediate.

            Closing SOON!
            "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

            Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

            Thanks for 10 years of fun!

            Comment


              #7
              Difference in mounting adapters; shaved in the foreground



              Also, you can see how the OD is sanded on two sides to fit

              Comment


                #8
                vifa makes nice home stuff. you may be a little disappointed with the sound from a slik dome in the stock location though. i ended up swapping to a titainium coated tweeter after the silk domes i installed. it was a nice inbetween the silk and an actual titanium dome (really harsh)
                seien Sie größer, als Sie erscheinen


                Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

                Comment


                  #9
                  Thanks for the input. Harsh high end goes through me like a knife. What exactly did you end up using?

                  Part of the draw to the vifas was the fabric dome, but a big part was the ability to install in the stock location. In this regard I had few alternatives. There are quite a few tweeters available, but it was unclear how many could be removed from their housings and be made to fit the 2" diameter limit of the OEM pods.

                  I plan on testing them out today.

                  Comment


                    #10
                    I seriously love my old silk domes in the stock location, most metallic ones are much too harsh for me... guess it just depends on the tweeter?
                    "A good memory for quotes combined with a poor memory for attribution can lead to a false sense of originality."
                    -----------------------------------------
                    91 318is Turbo Sold
                    87 325 Daily driver Sold
                    06 4.8is X5
                    06 Mtec X3
                    05 4.4i X5 Sold
                    92 325ic Sold & Re-purchased
                    90 325i Sold
                    97 328is Sold
                    01 323ci Sold
                    92 325i Sold
                    83 528e Totaled
                    98 328i Sold
                    93 325i Sold

                    Comment


                      #11
                      Nice work!
                      I attempted the same thing with my PPI tweets. The radius fit, but the magnet depth on the back side wouldn't allow the sail to fit properly. I'd say just keep that in mind if you use any other tweeters. I ended up using some of the angled cups and surface mounting them to some tweeter blanks.
                      [IMG]http://www.r3vlimited.com/board/

                      Comment


                        #12
                        Wait a minute, I just did a set of PPis in the stock pods, just a couple weeks ago...

                        Did you pull the grille off the PPI? Did you get all of the BMW tweet out?

                        The groove that the grille fits into was a perfect mount to the stock pod, I mean flawless!

                        Closing SOON!
                        "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

                        Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

                        Thanks for 10 years of fun!

                        Comment


                          #13
                          Originally posted by Schnitzer318is View Post
                          I seriously love my old silk domes in the stock location, most metallic ones are much too harsh for me... guess it just depends on the tweeter?
                          This is why I always tell people to go out and listen to as many different speakers as possible, as hearing is not the same for all people :)

                          I like the silk domes myself as well, followed by quality aluminum tweeter. Here is an example of good quality inexpensive aluminum tweeter that still sound smooth - http://www.parts-express.com/pe/show...number=275-130
                          Mtech1 v8 build thread - https://www.r3vlimited.com/board/sho...d.php?t=413205



                          OEM v8 manual chip or dme - https://www.r3vlimited.com/board/sho....php?p=4938827

                          Comment


                            #14
                            Originally posted by StereoInstaller1 View Post
                            Wait a minute, I just did a set of PPis in the stock pods, just a couple weeks ago...

                            Did you pull the grille off the PPI? Did you get all of the BMW tweet out?

                            The groove that the grille fits into was a perfect mount to the stock pod, I mean flawless!

                            I tried mounting them on the surface of the pod and they fit A+ but they would hit the dash a little when I closed the door. Mounting them from the back side of the pod the magnet wouldn't clear. I removed the grill but it looked like the beveled plastic housing was fixed to the tweeter so I didn't try to remove it.
                            Is that what you did, removed the housing?
                            [IMG]http://www.r3vlimited.com/board/

                            Comment


                              #15
                              In this picture, the bottom pod has the factory mounting ring left in, the top pod's mounting ring came out with the tweeter.



                              The difference is about 1/8th inch of available mounting depth...

                              Comment

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