ALD

15/10/2026

The next project - ALD A20 "Physica"

The A20 "Physica" is a minimum-phase, supercardioid loudspeaker featuring a two-meter-tall mid-frequency line array that creates a horizontal acoustic fan (HFD) dispersion pattern.

While primarily designed for use with subwoofers, the A20 "Physica" performs excellently on its own—delivering bass down to 38 Hz, which can be extended to 26 Hz with moderate equalization.

The soundstage is unlike anything you’ve experienced before, and the slam produced by the eight 6½-inch bass drivers is fierce!

06/09/2026

Loudspeaker design techniques remain essentially unchanged since the 1950s. Over the past 70 years, loudspeaker design has advanced surprisingly little compared to other audio reproduction technologies. Will we ever see a true industrial revolution in loudspeaker design?

Read more on my new blog:
Suomeksi: https://www.aldspeakers.fi/blogi/perinteinen-kaiutinsuunnittelu-vs-briggs-stratton/
In English: https://www.aldspeakers.fi/en/blog/traditional-loudspeaker-design-vs-briggs-stratton/

Kaiuttimien suunnittelumenetelmät ovat edelleen tyypillisesti kuin suoraan 50-luvulta. Viimeisen 70 vuoden aikana kaiutinsuunnittelu on mennyt eteenpäin…

03/08/2026

My thoughts on how my design work has evolved over the years.

https://www.aldspeakers.fi/en/blog/ald-a10-the-evolution-of-design-theories-over-30-years/

03/07/2026

Our website is now live!

ALD is a design firm specializing in the latest and most advanced loudspeaker technology. You’ll find here the information on our history, design philosophy, and new models, as well as a blog where I plan to jot down a few things in the future.

Feel free to take a look:
In English: https://www.aldspeakers.fi/en/
In Finnish: https://www.aldspeakers.fi/

16/04/2026

We measured the distortion of the A10 at 100 dB levels from a distance of one meter:

Frequency D2 D3 D4
200 4,9 0,58 0,12
1k 0,42 0,21 0,015
5k 0,78 0,04 0,004

As you can see from the numbers, the resistance box loading at low frequencies (200Hz) somewhat increases the 2nd order distortion component, but otherwise the readings remain low.

That 100 dB level is really loud! I would have liked hearing protection here..😀

As you can see, the treble distortion with 3rd and 4th order distortion components remains almost non-existent. This is what happens when using first-class tweeters. I guess no one expected anything else..😉

Overall, the distortion components emphasize the 2nd order component, i.e. the first even component. In other words, the same as in tube amplifiers.

So the ALD A10 is a tube-sounding constant directional radiator with horizontal fan-shaped dispersion 🙂

14/04/2026

ALD A10 freefield responses to different angles. As you can see from the curves, the A10 behaves completely differently compared to traditional speakers.