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4-channel I2S firmware update for USB boards

Audial USB interface boards have two data outputs, normally required for Philips simultaneous data (or any other split channel) protocol. On the other side, I2S protocol is time multiplexed, so one data signal carries two channels. The latest firmware turns Audial USB board into 4-channel interface, with I2S output, and two channels available at each data connector.

Of course, with two stereo DACs it can be used as two-way digital crossover. At this moment this firmware update is available for boards with 11.2896 / 12.288 MHz master clocks.



Plans for 2018

The year 2018 will be one of Audial’s most active so far.

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USB interface, series 2

Originally released in 2016, as ready made module, this high quality asynchronous USB interface featured galvanic isolation, two XO master clocks and reclocked output. It was unique for its ability to output TDA1541A simultaneous data format, but it could also output I2S / SPDIF, or PCM1704 format, supporting dual balanced DAC topologies at that as well.

This interface was offered again in 2017, both as module, with u.FL, and as completed device, with BNC output connectors.

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Another story about TDA1541A: 384 kHz

So, is it 384 kHz capable?

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Binding posts

Premium version of Model A uses Audial made, real copper binding posts. Now these are available for separate purchase.

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Back to the roots: 14 bits (of TDA1541A)

How much the number of bits does matter? TDA1541A distortion performance shows no practical difference between its regular 16 bit, and 14 bit “mode” of operation. When it comes to the ladder (“R-2R”) DACs distortion, it looks like everything is about converter accuracy. More bits improve only on S/N ratio.

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Even though it was discontinued in 2009, the interest in this great DAC never actually disappeared, so it had several after-runs. “DS” was its 2015 release.

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Transformer coupling pros and cons

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. Actual benefits and shortcomings will also depend on the environment.

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Model A ultimate volume control

Two new articles bring more details about the ultimate volume control used in the Model A. The first article describes the approach, and the second brings more information about cermet potentiometers.

Check them out.

Model A volume control

Cermet potentiometers



About Audial

Officially operating for more than decade now, Audial became well established among audio devotees, and recognized for its unique products qualities. So far we shipped the products to more than 40 countries.

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