Steffens DXT-MON tower speaker

dxt_mon_stand_haMy loudspeaker Odysee started a few years ago and was based on various ready loudspeakers in the price range 1000-2000 Euro. Among them were models from KEF, Canton, Nubert, Elac, Phonar and Audio Physic. Of course they were not bad at all, certainly not. However, I have managed in my listening room with none of the speakers even come close to the stereo image that I have experienced while listening to the dealer in an acoustically good room. Consequently, I first dealt with the optimization of my listening room, but of course there are certain limits.

In the meantime, I also learned how important the bundling behavior of loudspeakers is. Here, however, virtually all ready-made speakers are very wide and uncontrolled emitting, apart from studio monitors. About different broadbands, I then switched to the DIY corner. And indeed, the stereo image in my room improved significantly with the increased bundling of broad bands in the treble range. The whole thing was bought with a very narrow sweet spot, audibly reduced resolution in the treble range and tonal errors. So the search went on.

Then I came across bundling concepts with Waveguide and thus soon on Alexander Heißmann. A short time later, I had the DXT-RLY in my house for testing, and was very pleased, they linked a controlled bundling with an absolutely neutral playback, the room image was excellent, the sound completely detached from the speakers. The only sticking point: I really wanted a small slender floor speaker and no shelf box ... However, Alexander was quite quickly convinced that a slim stand box would expand its portfolio but still excellent 😉 And so it happened that Alexander (after a few nights of simulating I suppose ) green light for a tower speaker based on the DXT-MON gave. From previous projects I already had 2 Hypex DSP amplifiers, so it should be fully active.

So Alexander put together a kit, wood came from the hardware store (28mm MDF for the front, 18mm MPX birch for the body), then it started with milling, gluing and grinding ...

Since I had already knocked a few speakers together, the milling of the chassis with the router and the assembly of the housing was no longer an issue. However, I had never attached beveled bevels, so that was new territory. For this purpose I attached steel strips (from the hardware store) with screw terminals. I first tried the foxtail method (sawing along the edge), but the saw was constantly jammed. I then switched to the orbital sander. With a 40er sheet, the MDF turned rather quickly into dust, the bevel succeeded perfectly. Alexander also told me about a method using a router, but I did not try that since the MDF was so easy to grind.

Second crux for me was the neckline for the bass reflex tube. I can only recommend to anyone to make the first milling on a specimen, since felt only a few microns the difference between "does not go in" and "crap, sits much too loose" can make. The rest then went fast, damping with alubutyl attached, wiring, damping pure, chassis pure.

For the final vote I drove with the two prototypes to Alexander, where we did the fine tuning of the DSP points, the damping of the speaker is still completely optimized and also carried out the final bass reflex tuning.

It was followed by a trial listening in direct comparison with the DXT-RLY. Both great speakers with naturally similar tuning, but the DXT-MON-STAND is already audible deeper into the bass cellar. Otherwise, she has all the virtues mentioned above:

    • absolutely neutral tonality
    • complete detachment of the music from the speakers
    • excellent stereo picture
    • great detail resolution in the treble range
    • crisp and fast basses

After a long day of pink noise and hundreds of measurements, I happily drove home with 2 DXT-MON-STAND speakers and was never disappointed in the process! Thanks again, Alexander!
Achso, I have not solved a problem: since I do not want to give up the day no more on the speakers I could not make the final finish so far, it is planned to paint the front matt black ...

Addendum ...

And that with the matte black finish has finally worked out 🙂

One thought on "Steffens DXT-MON tower speaker"

  1. Hello Steffen
    Thank you for the exciting article. The listening session was a lot of fun and interesting and instructive in many ways.
    I am very curious about the dull black front. Send me a picture if you are ready!

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