Acoustics

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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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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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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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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Resonance, standing waves and room modes

Room modes Resonance happens in systems that can oscillate. Rooms are such systems, and their resonances are called room modes. Loudspeakers excite these room modes more or less depending on their position, creating so-called standing […]

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Acoustical interference and comb filtering

Interference is what music rooms imprint on the reproduction of our music. Take a seat in the „sweet spot“ in front of two stereo loudspeakers. If both radiate the same frequency, their signals add up […]

David   Acoustics
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Decibel

Most acoustical data uses „dB“ scales. Therefore, it is unavoidable to do the logarithmic dance, in order to interpret measurements. Let us take a short look at it. A perfect human hearing resolves acoustical powers […]

David   Acoustics
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Wavelength

Sounds, pure tones and sinusoids. Most musical sounds contain a complex mixture of frequencies. Hence, the spectrum of music usually has a wide range. But for measurements and theoretical considerations we often look at so-called […]

David   Acoustics
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Acoustics – Introduction

TestHiFi is easy to use and provides meaningful measurements. The app TestHiFi is programmed to measure and interpret acoustical data most easily. Consequently, it does not need any understanding of the theory behind measurements and acoustics. Although the […]

David   Acoustics
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