Author

Polak Hans

After leaving high school, Hans Polak decide to study medicine, but was dissatisfied with the distinct lack of technical focus within that curriculum. He then switched to electro technical engineering and received his MSEE in 1979. During his second study he already started to work for a leading player in the Dutch defence industry, where he made major contributions to the design of fully digital radar and sonar systems. Among others he designed what in all probability was the biggest chip at that time. This chip was to perform an ultra-Fast Fourier calculation for real time radar signal processing. This specific knowledge also came to play a crucial role in several product developments hereafter. Immediately after having graduated, Hans founded the first Dutch computer manufacturing company, Holborn. Under his supervision both hard- and software were successfully designed, developed and manufactured entirely in house at a time when the IBM PC still was not there for some years to come. The Holborn 6140 is still on display at Amsterdam UVA University’s computer museum. When the IBM PC was finally starting to change the market dynamics for good, Hans jumped in on the opportunity to start an operation with AutoCAD, soon becoming the biggest reseller/ distributor on the Dutch market, with subsidiaries in the UK and in Belgium. After having sold this company in the late 80’s, he has been active, to this very day, in a mixed portfolio of organisations as investor, strategic advisor and business recovery specialist. Among them was a German software company responsible for developing and producing all the planning- and ticket sales for the Deutsche Bundesbahn. After having listened to a pair of Quad electrostatics for the first time, audio became an important leisure pursuit, in parallel to his academic and professional career that remains to this day. In the early stages of his audio interests, much attention was given to improving high-end audio designs, whilst in recent years more and more attention is given to developing audio components from scratch. At the specific request of a Dutch high-end retailer Hans designed a no holds barred Phono Preamp which was subsequently manufactured in a limited series and sold under the Allard Audio label as the absolute reference within their portfolio.

Written articles
Letter of Stefan Heinzmann to Hans Polak on OEO (vol 10)

Mr. Heinzmann takes issue with some of Hans Polaks' statements regarding the need (or not) of grounding both ends of a cable sceen, or just one end. Their views remain different but the...

RIAA revisited, or how to better judge documented figures

Hans Polak noticed that the noise specifications of RIAA preamps are often given in units and operation conditions that make it hard to easily judge the comparative merits of different designs. He...

Current Driving of Loudspeakers - book review

With this book, the author succeeded in convincing me that for loudspeakers, current drive is, in theory, superior to voltage drive. But  the industry took another road and has most likely...

Pin 1 revisited, adding OEO to an accepted rule

Hans Polak used to strictly adherence to the XLR ‘pin 1’ connection rules in his fully balanced audio system. Yet, when switching on his desktop dimmer-lamp, he still heard strong...

On Digital Audio Formats and the Nyquist - Shannon sampling Theorem

On Digital Audio Formats and the Nyquist – Shannon sampling Theorem      Vol 8

Hans Polak

In Linear Audio Volume 5 Dr. Hans van Maanen made the case for...

An attempt to design a non plus ultra Phono Peamp

There are numerous designs and many commercially available Phono Preamps on the market, but there are  not that many falling in the category extremely good, and if we may believe...

Digging deeper into Error Correction

Hans Polak read with great interest Giovanni Stochino’s articles addressing active feedback and error correction in LA Vol 7 and 8. Several implementations were given, illustrating how...