Audio Blog

We write not only about news from the audio world, but also about issues related to our products, about not-so-well-known concepts from the field of electrical engineering, or about ingrained superstitions without technical justification. You can also find out about new and precise recordings that we like.

Luxury Brocade Combined with an Acoustic Solution
29. 4. 2023


Are you interested in modern trends in interior design? Do you prefer high quality to mediocrity? Then feel free to read on. In this article, we link the traditional role of fabrics in interiors, namely of luxury brocade, to its practical function: acoustic optimization of modern interiors. We will explain the basics of acoustics and show you how to add another very important yet invisible value to brocade fabric—acoustic absorption.

F4SX Audio Power Filter
30. 4. 2021

In this article, you will learn why a good audio power filter is essential these days, why we use latest nanocrystalline materials, how does a passive power filter help in audio and more.

Background Noise in Audio
1. 8. 2020


Our new listening studio is not for listening experiences only. It provides us with a good enough space to carry out different experiments, measurements and tests. This article deals with background noise measurements of an audio system, in the hearable spectrum. Using a microphone, we measure the noise coming directly from the speaker. We are going to compare a real noise of an amplifier, once powered directly from the power grid, once using RD EMI Neutralizer power filter.

Building a High End Listening Room 4: Fine-tuning the Acoustics
15. 5. 2020

We bring you a comprehensive account of room acoustics tuning in our listening studio in Rožnov pod Radhoštěm. We have acquired a space in which we were able to realise our demanding requirements, ultimately leading to the best possible acoustic properties of the reference room.

Building a High End Listening Room 3: QRD67H – Hybrid Diffuser
2. 5. 2020

We finished a third step towards a perfect listening space. A hybrid acoustic diffuser now covers almost the entire ceiling. We tried to make a photo of it, but even a wide 10mm lens could not capture it in its entirety.

Building a High End Listening Room 2: Construction
21. 4. 2020

The second step towards our new high end listening space is behind us.

Building a High End Listening Room 1: Goals
17. 3. 2020

We are about to have a new listening room! On our hands, there is a space a construction of which we will be able to alter in order to reach ideal room proportions and gain the best possible listening space. The articles will be written continuously documenting the birth of the room. Ample acoustic and electrical measurements included.

Grounding Quality: Not Just for Audiophiles
18. 1. 2020

How and why does the grounding potential influence our audio system and how to improve it.

Measuring Power Grid Interference in Practice
23. 11. 2019

Would you like to know what interference occurs in the power grid? Why deal with filtration? To illustrate the issue, I made measurements at four different places. For comparison, I used a common EURO cable and RD Power Filter.

We shall Plant a Tree for every Product Sold
2. 11. 2019

Enjoying rock climbing as a free time activity, I feel close to nature and its sustainability. As a company, we do not wish to simply slide on the ecological wave, we want to actually act.

Acoustics Theory – Sound Behaviour in Closed Space
30. 3. 2019

To understand sound behaviour in closed space better, we have to get into a bit of theory.

Room Acoustics: Not just for Audiophiles
30. 3. 2019

The most perfect speaker systems will not deliver great results in lousy acoustic conditions. Are you interested in improving your room acoustics? Read on.

Perception of Music: People Are Not Machines
14. 5. 2018

Why do our ears dislike the clean curve produced by an electronic tone generator?

What Is an Audio Power Filter For?
23. 1. 2018

Are external power filters useful in any way? Why are high quality EMI (electromagnetic interference) filters not a part of most consumer electronics devices? Should we care about high frequency interference, considering we cannot hear it or see it?

Audio and ElectroMagnetic Compatibily
22. 1. 2018

What is “electromagnetic compatibility”? Does it serve any purpose nowadays, or is it an anachronism? Why most consumer electronics cannot withstand a lightning strike

The Skin Effect Exists
19. 1. 2018

Is the term “skin effect” often arising in the audiophile world only a “voodoo fallacy”, or does this phenomenon, as described by J. C. Maxwell in 1892, really influence music reproduction?

The War of Dynamic Range
22. 12. 2017

Soon it will have been nine years since Ian Shepherd declared the Dynamic Range Day. Has something changed?

Modern Renaissance of the Horn Cabinet
20. 12. 2017

The principle of a horn cabinet (also known as horn baffle or transline) has been known for a long time. The Maya, the Celts and Egyptians (even in the predynastic period) were able to use the physical properties of a hollow animal horn

Musica Nuda
7. 12. 2017

The unconvential Italian duet—Petra Magoni and Ferruccio Spinetti—released great audiophile album Complici in 2011.

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