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Fast Fourier Transformation

Today, Fast Fourier Transformation (FFT) based analyzer software is cheap or available for free. One such very nice and free program is REW (Room EQ Analyzer). It can do much more than analyze room acoustics, […]

David   Allgemein . Measurements
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Frequency response left versus right, sum and stereo

Frequency response This is quiet an established measure, of course. However, even frequency response is not fully accepted. We wrote several blogs related to flat response or peaks and drops in frequency response and we […]

Wilhelm   Allgemein
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Tube sound again

For objectivists the characteristics of tube amplification is mostly due to additional components of sound. Many tube lovers call it a higher purity of sound.Others again enjoy „easier listening“ in terms of warmer and maybeslightly […]

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Signal path through a tunnel or what actually limits good sound?

Trying to determine criteria for good sound and looking for support to determine it better. Since decades professionals and audiophiles measure sound parameters and yet it is not possible to fully predict the sound quality […]

Wilhelm   Allgemein
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Bits are Bits ?

Recently I was testing several solutions to reproduce audio files, based on personal computers. Just to see if bits are bits. I had been using JPLay for years (with mixed results in terms of stability or […]

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Search for headphones which help me learning to identify specifics of time and phase coherent sound

Why my search for headphones?  At TestHiFi, we put ourselves onto a challenge, to drastically simplify audio measurements. That should enable any mobile phone users for reasonable audio measurements. It should be so simple, that […]

Wilhelm   Allgemein
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The Sound of Tubes ?

At TestHiFi we discuss and develop ways to measure aspects of music reproduction. Sometimes, working on my own loudspeaker projects, such aspects draw attention. About such an event I want to write this time. When […]

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How much quality of a microphone do you need for simple measurements

Simple measurements can tell you something How much quality of a microphone do you need for simple measurements? As David explained in his last blog simple distortion measurements. It is of course possible to extract relevant insights […]

Wilhelm   Allgemein
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Simple Distortion Measurements

Do simple distortion measurements make any sense? Even if taken from loudspeaker output? With simple, non-laboratory grade test instruments and environment: can we read anything interesting out of distortion measurements? I made some, using REW […]

David   Allgemein
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Flaws in audio at listening position – phase coherence or polarity variation

Theory explanation    I found the explanation of Jeff Towne: Its a phase youre going through quite understandable, therefore I refer excerpts including a listening example of it here. It’s a perplexing problem: the mystery of […]

Wilhelm   Allgemein
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