CNC adapter plate for Vifa XT-300 (XT25TG-30 / 04) and XD-270 F / 4

CNC adapter plate for various Scan-Speak and Peerless tweeters on WG-300 and PCT-300

There are some tweeters from Scan-Speak and Tymphany, all of which share the same front panel. One or the other of them also measures itself excellently on the P-Audio (PCT-300), or Monacor (WG-300) waveguide.

In order to connect the drivers cleanly with the sound guide, an adapter plate milled in CNC was created after many test series, which allows simple and very precise installation.

The following tweeters are suitable for the conversion

3D printed adapter plate in the shop

Construction of the adapter plate with "home remedies"

With a jigsaw, cordless screwdriver, router and the following step-by-step instructions, building the adapter plate yourself shouldn't be a problem. It doesn't even have to be measured 🙂 Let's go ...

  • Download PDF (click on the picture)

  • Print out with Acrobat Reader (select option "actual size"!)
  • Size check: Outer diameter 120mm
  • Stick on a 9mm strong piece of MPX / MDF / screen printing plate (spray glue / glue stick ...)
  • The drilling holes => drill press is an advantage!
  • With the circular milling device (each speaker should have one) 3mm deep to appropriate mark milling (D67mm)
  • Use the jigsaw to saw the inner hole and saw off the plate in the last step

From the practice with the "home remedy method" another supplementary tip from Thorsten (

If you glue your artwork directly onto the substrate (eg MPX), you will have the difficulty to get it down again later. For visual reasons, that bothered me and came up with the following idea: Before you glue your artwork on the MPX, just past the MPX with tape. Now the artwork will be cut to the size of the MPX board. Spray glue is then sprayed onto the package tape and allowed to dry for about 5 minutes (Note the spray adhesive is not on the paper spray!). Now the print template can be glued on.

Once all drilling and milling work has been completed, the package strap can easily be pulled down again from the MPX board.


First, the front panel of the tweeter must be removed. On some models, this is easily fixed with a silicone-like adhesive. In this case, with a large flat-head screwdriver discreetly "lever" as shown in the following picture. Work slowly and evenly. In advance, of course, the screws of the front panel should have been solved (TX10).

Dressing the waveguide neck

The adapter plate is placed on the sound guide and the neck is ground flat with circular movements (⇒ dust mask).

The following video shows the final montage

Contrary to the indication in the video no M3x16mm, but M3x12mm Screws used! The M4x10mm are welcome, but they do not have to be longer.

Finally, two shots of the Scan-Speak D2604 / 833000 or 830000 & the Peerless XT25TG30-04 with waveguide


You do the conversion on your own responsibility! I accept no liability. Possibly. you lose your warranty claims during the conversion.

I did a lot of conversions and nothing ever happened. I think the manual is pretty foolproof 🙂

The plans of the adapter plate are the intellectual property of, Alexander Heißmann. Any transfer requires my express consent.

... coffee is available from 1 € 😉

14 thoughts too "CNC adapter plate for various Scan-Speak and Peerless tweeters on WG-300 and PCT-300"

  1. Hi Alex,

    When 'trial operation' my slightly modified Disco-M I noticed that at elevated levels an occasional
    , Whistle 'is the tweeter to notice.
    Although I was careful when cutting the adaper ring, I noticed in the area of ​​the three fixing screws
    for the Scan-Speak Discovery D2604 / 833000 a small air gap. With a little bit of permanently elastic glue (silicone) I sealed the small gap and that was good.

  2. Dear Alexandere,

    Would this be the best 3D printed in FDM, SLS or SLA?

    What percentage infill do you recommend?

    Thank you,


    1. Hi David
      FDM should be absolutely good enough ...
      With the infill I am not 100% shure. As it is a relatively small piece I would like to print it solidly. PLA should do the job.
      I'm not so into 3D printing, so do not take my advices to seriously

      Best regards

  3. Hallo,
    is there any news or concrete results about the "Waveguide on ScanSpeak 6600" test? I think it was hinted on the page that it does not work metrologically?


    1. Hello

      As I see it should work mechanically. Metrologically but that would have to be checked.
      If you like you can send me an 2 Scan Speak 6600 AirCirc and I will test it and write a report about it.

      Best Regards

          1. Hello, interesting thing with the waveguide, the measurements for the Speak 6600 AirCirc would also interest me very much.



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