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 should not cause any problems. It doesn't even have to be measured 🙂 Let's go ...

  • Print out the PDF (included in the respective building folder) using Acrobat Reader (choose the “actual size” option!)
  • Size check: Outer diameter 120mm
  • Glue on a 9mm thick piece of MPX / MDF / screen printing plate (spray glue / glue stick ...)
  • Drilling the holes => upright drilling machine 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 additional 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, use a large slotted screwdriver to "pry" it up discreetly as shown in the following picture. Work slowly and evenly. The screws on the front panel should of course have been loosened beforehand (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).

Finally, two recordings 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 made a lot of changes and nothing ever happened. I think the instructions are pretty "foolproof" 🙂

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

... you can get a coffee from 1 € 😉

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

    1. Hello Detlef

      Give me a little more time ... I'm still working out who will mill this for me and under what conditions.

      Best Regards

    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.



  1. Hallo,
    Is there any news or concrete results for the test "Waveguide on the ScanSpeak 6600"? I think it was indicated here on the page that it does not work metrologically?


  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. Hi Alex,

    During the 'trial operation' of my slightly modified Disco-M, I noticed that an occasional
    'Whistling' through the tweeter is noticeable.
    Although I was careful when cutting the adaper ring, I noticed in the area of ​​the three fixing screws
    a small air gap for the Scan-Speak Discovery D2604 / 833000. I then sealed the small joint with some permanently elastic adhesive (silicone) and it was good.

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