Linear Audio, your tech audio resource, continues to offer you stimulating, interesting and thought-provoking articles as well as projects you can build. Volume 7 is our 8th issue. Volume 7 starts of with a guest editorial by Joachim Gerhard who documents, from a personal view, his year long adventure through listening space to end up with the G-pole speaker. We welcome several new authors: Barrie Gilbert contributes the 1st part of several, starting with explaining how to use simulation for design in an intelligent way. Malcolm Hawksford draws on many years of teaching to give us an overview of equalization in audio. Giovanni Stochino reviews the results of many years of research covering different error correction topologies and discussing their pro's and con's. Several circuit design articles discuss advanced power amplifiers (David Zan), a simple yet effective low noise measurement amplifier (Burkhard Vogel), and a hybrid phono preamp (Stuart Yaniger). George Ntanavaras went on a quest for the ideal speaker enclosure shape for surround use and came up with the Prisma loudspeaker. Vol 7 has two reviews: Marcel van de Gevel read Morgan Jones's 2nd edition of Building Valve Amplifiers, and Stuart Yaniger and yours truly reviewed the Smyth Research Realiser A8, a 'listening room / speaker virtualiser'. And, traditionally, Stan Curtis in his column throws down a gauntlet with a possible way to explain (and cure) audible differences between different implementations of the same circuit. If you have an idea on how to verify his solution in a controlled way, let me know!

 

The G-pole –An adventure in Space Vol 7
Joachim Gerhard

In his Guest Editorial, Joachim Gerhard gives a very personal rendition of his many years of searching for the ideal speaker configuration. He advances by leaps and bounds, sometimes due to coincidental experiences, alternated by flashes of unexpected insight. Joachim makes it also clear that advancements come only after continuous questioning and not giving up even in the face of what seems a dead end.

 

Experimental Design in Simulation – A Sine/Cosine Oscillator (Part 1: basic theory) Vol 7
Barrie Gilbert

When Barrie Gilbert turns his mind to an area of design, expect the unexpected. In this first article in a series of several, Barrie starts the design of a versatile audio test bench sine-cosine generator. Apart from being the goal, the design is also a vehicle to explore the strong points and traps of using Spice simulators for design work. Yet another goal of this design series is to show how current mode circuits can often solve design problems more elegantly and efficiently than traditional voltage mode circuits.

 

The Prisma Loudspeaker – a shapely adventure Vol 7
George Ntanavaras

George Ntanavaras wanted to design some simple speakers for his surround system. However, he found that things are not always as simple and easy as they seem. In the process, he tested many different physical shapes and configurations and found one that fulfilled his requirements and still could be placed unobtrusive in the average listening room. The article present measurement on the various prototypes and discusses the reasoning leading from one to the other.

 

A Poor Man’s Measurement Amplifier Vol 7
Burkhard Vogel

Every audio designer finds himself eventually in the situation that he needs a very low noise preamplifier to interface between the tiny circuit signals and his test equipment. Such an amplifier should ideally be perfectly linear, very wideband and noiseless. Burkhard Vogel gets very close with his PMMA. This article presents a design ready to be build, with a thorough theoretical analysis supported by MathCad graphs as well as prototype measurements.

 
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