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Welcome at Physical Lab! 

Physical Lab is your source for all demands in the audio industry. Our young, innovative and highly motivated team is specialized in the fields of product testing, acoustic engineering, mechanical engineering, electronics engineering, driver and crossover design and industrial design.

Take a look!




We're happy to announce our new DIY-Kit for hobbyists based on the Radian 5312Neo BE coaxial driver. This 12" woofer utilizes a huge 3" compression driver made of pure beryllium. The speaker combines vintage look with modern developement. The speaker has a very low crossover frequency with extremely steep filters (72dB). This way we achieved a really nice horizontally and vertically behaviour. The impedance was linearized and looks like a resistor. Even the weakest amplifiers are able to drive this speaker without any problems.


PostRetro 44

You can buy the Kit and find further informations like the technical datasheet on




If you are interested in our new ScanSpeak DIY Kit from the German magazine Klang&Ton 5/2023 please follow the link to the Quint-Store Shop where you can also find more details and the technical specs sheet:





Jan, 2022

We are very proud that we had the opportunity to develop a real unique bookshelf speaker called Viola S without any limitations on the engineering side for our customer LiveActAudio. The result is a very small 3-way speaker with an outstanding performance. The custom 5” coax drivers comes with a small compression driver that is able to deliver much more dynamics than a usual tweeter. No need to say that coaxial designs are showing much better directivity behavior than conventional tweeter/woofer arrangements that typically show interference effects due to the distance between the tweeter and the woofer. Even the full 3D balloon plot shows exceptional behavior of the speaker in any direction (see below in the vid). Distortion and especially IMD distortion is much lower as in usual 2-way designs. Everything on this speaker is special. This little beast is one of the best bookshelf speakers available. Feel free to contact our partner for more info’s.

 Test Bench Results

Test bench results Viola S


Nov, 2021

Working on a unique loudspeaker and amplifier switch box for high end users and scientific research. The switch box enables the user to choose between two speaker pairs and two amplifiers. It also comes with a level adjustment for each speaker pair and amplifier. This way one can switch between a high sensitivity speaker and a small bookshelf speaker with the same SPL. It is also possible to switch between sensitive valve amps, as the amps will always see a load when switching.

Possible Modes:

  • Speaker pair A/B
  • Amplifier C/D
  • Mixed Speaker/Amplifier A/B/C/D

                        Scientific blind tests can be made easily and reproducible!

The switch box also comes with an integrated sine and noise generator for customers without an audio analyzer. Level adjustments can be made very easy with a mobile phone using a RTA App.

Stay tuned!

March, 2021

Worked on a study of a helmet design for skydivers. Skydivers can fall quite fast in a typical range from 160km/h to more than 300km/h. The noise of the wind and mechanical strain can be quite high! Dimples, known from golf balls, can effectively reduce noise. A special dimple design with new linings showed, that noise can be reduced by more than 6dB in the critical frequency range of our ears! Special test equipment was built to measure both vibration and SPL inside the helmet with a kemar head.


Nov, 2016:

Chris N. Strahm, founder and President of LinearX, passed away on Nov 25, 2016, of natural causes. His unbelievable knowledge of electronics, software and acoustics was outstanding! Chris was one of the guys who changed a whole industry. Even after many years LMS and LEAP are still industry standard products and both are used intensely.

R.I.P Chris N. Strahm   ;   We will miss you as a business partner and a good friend!

If you need special assistance or support regarding LinearX products, please fell free and contact us! You can download LinearX software and updates on our homepage!