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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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Some new HiFi adventures

A Re-Visit Back to a friend and customer’s place I had a strange experience which I would like to share. And still don’t quite understand … The System is complex and very high quality : […]

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Flaws in audio at listening position – stereo channel time coherence

Theory explanation    Stereo, a method of sound reproduction We described stereo effects to some extend already in the criteria stereo capability and Frequency response channel correlation. Stereo is a method of sound reproduction that […]

Wilhelm   Allgemein
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Woofer Size

Why woofers need to be large to radiate efficiently Due to a recent discussion about efficiency and directivity: Is higher efficiency – like with horn systems – a result of higher directivity? Produced by restricting […]

David   Acoustics . Loudspeakers
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Flaws in audio at listening position – frequency group time coherence

Theory explanation    Time and phase coherence is a very complex topic, probably not yet fully researched which and how those issues directly influence or correlate to the subjective perceived sound quality. However, it is […]

Wilhelm   Allgemein
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Listening

Strange sounds Recently, I walked towards the underground station and heard a strange noise. From a construction site, hammering could be heard. But, reflected from the stations walls, the “tack, tack, tack” sound was changed […]

David   Allgemein
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Why isn’t time and phase a prominent topic in audio?

Stereo channel time and phase coherence Sound mixer or sound engineer proactively design the sound with in-phase or out-of-phase channels. More mono able sound, i.e. channels in-phase will sum-up in levels. Amplitudes of same frequencies […]

Wilhelm   Allgemein
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