Author

Self Douglas

Self Douglas

Douglas Self has a considerable reputation as an authority on audio power amplifier design, and is well-known for his rigorous, skeptical, and thoroughly practical approach to design. He is responsible for the concept of the Blameless amplifier, which gives very good distortion performance from straightforward circuitry.

Douglas was born in Suffolk, England, and studied engineering at Cambridge University where he achieved first-class honours. He then moved on to study Psychoacoustics at Sussex University. He has spent many years working at the top level of design in both the professional audio and hifi industries, and has taken out a number of patents in the field of audio technology. He gave the Power Amplifier Masterclass at the AES convention in Amsterdam 2008, and is currently mainly engaged in consultancy work. He is a prolific author and the books he has written include: The Audio Power Amplifier Design Handbook, Self On Audio, and most recently Small Signal Audio Design. Douglas is a member of the Audio Engineering Society.

Written articles
The Devinyliser

This investigation grew out of a letter that was published in HiFi News at the end of 2015, where Patrick Wallace points out that vinyl signals always come with a background of low- frequency...

A low-noise preamplifier with variable-frequency tone controls

In 1996, Douglas Self published a design for what became known as the Precision Preamplifier, which included a treble/bass tone control with variable turnover frequencies. Starting with the idea...

Letter of Marcel van de Gevel to Douglas Self on The Devinyliser (vol 11)

Douglas Self's  artcle on differential rumble cancellers (vol 10) provoked Marcel van de Gevel to try to find low-pass filters that eliminate the need for the all-pass filter. He did find...

Inclusive Compensation and Ultra-Low Distortion Power Amplfiers

Two things define the distortion performance of a power amplifier; the open-loop linearity of the circuitry, and the amount of negative feedback that can be safely applied. The latter is...

Rumble filtering - like you really mean it

‘Rumble’ is actually not a very accurate description. The subsonic signals are not audible in themselves, but the intermodulation they cause in bass units certainly is. The worst...

Self-improvement for capacitors

Audiophiles are often told that their new equipment, components or cables need to be 'broken in' to deliver their best performance. So far, technical backup of the phenomenon is (with the...

Optimizing RIAA realization

Douglas Self approaches 'RIAA optimization' from an unexpected slant: which circuit configuration makes the most effective use of the capacitors used, in terms of the lowest required...