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High Frequencies (HF) – More Questions Than Answers

The picture on top shows 100 ms of the room response after an initial impulse was radiated by the loudspeaker. Since low frequency (LF) energy is distributed over time what we see is mostly high […]

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Music for unborn babies

Some studies indicate that, if you play music to the unborn babies, they can hear and even react to the sound by moving or with the rhythm of their breathing. Research and specialists make us […]

Wilhelm   Allgemein
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Modal coupling – aka Low Frequency Optimization

Modal coupling is about how your loudspeaker’s and listening position influence the reproduction of low frequencies (LF) in your room. Fundamental frequencies We have been talking about room modes in the resonance blog. At a […]

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Signal latency and cutouts

Signal latency and cutouts are not the first thing that comes to your mind, when developing a tool to measure minimum criteria for HiFi capability of an audio system. Making things easier and user friendly […]

Wilhelm   Allgemein
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Acoustic radiation impedance

What is radiation impedance? Let us have a look at Wikipedia: “Acoustic impedance and specific acoustic impedance are measures of the opposition that a system presents to the acoustic flow resulting of an acoustic pressure […]

David   Acoustics . Loudspeakers
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How to separate the wheat from the chaff when selecting audio systems?

Wouldn’t it be good to have a label on audio systems that informs us about the product quality ranking? Like on TV, a full HD or 4K sticker. This would not differentiate between high-end products, […]

Wilhelm   Allgemein
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My HiFi Story

Music, and it’s reproduction Hi. This is David Haigner. I intend to share my personal reflexion about music, measurement and observations, based on my own journey towards high fidelity music reproduction. I will not care […]

David   Allgemein
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Why people buy crappy sounding systems

(and how they could test them before buying)… Listening or measuring A decision to buy a sound system is usually based on listening experience and merely on measurements. This is probably true for rather high-end […]

Wilhelm   Allgemein
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Reflection and Diffraction of sound

A complex mixture of reflection and diffraction happens to sound that hits an object of similar dimension as the wavelengths of the sound signal. Interestingly, sound waves bend around objects. Wavelength again The easiest way […]

David   Acoustics
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How to TestHiFi your own system at home?

Many people question why to test the own system at home. Most of them fully understand the value of TestHiFi when buying an audio system. TestHiFi helps to check the HiFi capability of an audio […]

Wilhelm   Allgemein
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