Classic and transformer coupling: System grounding difference

The use of signal coupling transformers requires a somewhat different approach to the system grounding.

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Another story about TDA1541A: 384 kHz

Can this old gem get there?

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Back to the roots: 14 bits (of TDA1541A)

By measuring standard low level performance at -60 dBFS (dithered sine wave), there was practically no difference between its regular 16 bit, and this 14 bit “mode” of operation. Noise floor, on the other hand, is somewhat higher, roughly speaking 6-12 dB, and that is what you would expect, given 2 bits difference.

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Transformer coupling pros and cons (in a nutshell)

Purely sonically, transformer coupled output has more calm presentation, with more quiet background, and somewhat more precise soundstage. On the other hand, transformers can lack some definition at the most bottom end. Still, possible benefits and shortcomings depend also on the environment.

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Cermet potentiometers

Audial Model A uses cermet potentiometer as premium part. The reason is simple: cermet is sonically clearly superior to any other potentiometer type. Cermet potentiometers are still however relatively unknown, so more information follows.

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Model A volume control

Model A uses the low impedance shunt potentiometer. This article brings more details about this ultimate volume control.

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Model A, one year later: Binding posts

Model A now sports copper plated copper binding posts. Here is why.

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Sweet spot of amplifier power

According to the common wisdom, the relation between the amplifier power and its sound quality may look like the relation of equivalence. “The more the better.” The truth is, the best sound quality is associated with certain working points, which also implies certain power. Insisting on (often redundant) power, actually can and does compromise the sonic properties.

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Designing the ultimate monolithic amplifier

A sum up of more than decade of designing and living with chip based power amplifiers.

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Sound of harmonic distortion

Harmonic distortion is one of the basic and most common ways to objectify sound quality of audio device. Yet, there is no consensus on its audibility. Here are several examples of distorted sinewave, to help your own understanding.

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