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2 von 2 Kunden fanden die folgende Rezension hilfreich
Excellent covering of an obvious topic for improvements in amplifiers.
13. Januar 2011
"Current-driving of loudspeakers" is simply a remarkable cookbook and recipy including: Science, worked calculations,
practical issues and completed projects, ready for use as they are, or for inspiration. Any technical person, including
DIY audio hobbyists like me, will be able to complete these amplifier projects, or make designs of their own.
With this book Mr. Merilainen has picked-up the long forgotten issue of driving loudspeaker voicecoils by a constant current
instead of constant voltage, which is the current (!) code of practice. This book prudently explains all the issues of
constant voltage drive versus constant current drive, with splendid covering of what scientific and technical pitfalls to
circumvent in the design and construction phase of the latter. Constant current drive can reduce/eliminate certain distortion
phenomenae generated in the voice coil/magnetic gap. These distortions can ,by far, be in excess of other distortions from
modern electronics, cabling or "non-linear copper" which seems to gather interest by many audio-enthusiasts.
Instead, constant current drive deserves due interest as the next logical step in the perpetual pursue of High Fidelity.
practical issues and completed projects, ready for use as they are, or for inspiration. Any technical person, including
DIY audio hobbyists like me, will be able to complete these amplifier projects, or make designs of their own.
With this book Mr. Merilainen has picked-up the long forgotten issue of driving loudspeaker voicecoils by a constant current
instead of constant voltage, which is the current (!) code of practice. This book prudently explains all the issues of
constant voltage drive versus constant current drive, with splendid covering of what scientific and technical pitfalls to
circumvent in the design and construction phase of the latter. Constant current drive can reduce/eliminate certain distortion
phenomenae generated in the voice coil/magnetic gap. These distortions can ,by far, be in excess of other distortions from
modern electronics, cabling or "non-linear copper" which seems to gather interest by many audio-enthusiasts.
Instead, constant current drive deserves due interest as the next logical step in the perpetual pursue of High Fidelity.
0 von 5 Kunden fanden die folgende Rezension hilfreich
Interesting but highly flawed
15. Januar 2011
The concept, yes, interesting. It has many implications concerning amplifier impedance, crossover design, frequency response. The author is too concerned with proving that low-impedance amplifiers are a "fundamental fallacy". English is not his native language and the text is difficult to parse in many places. However, there are massive errors as well. "The pressure radiated .. is proportional to diaphragm acceleration, not displacement or velocity." Wrong. If I excite a speaker with a triangle waveform, I do not hear a series of impulses (which is the acceleration). He also says "the mass of the the driver has nothing to do with how accurately a driver is able to reproduce transients." So, a woofer with a 20 gram diaphragm can reproduce transients as well as an electrostatic speaker? News to me. He says some interesting things here and there but many of his core concepts are simply wrong. No wonder the AES would not accept an ad for his book. The establishment is not out to get him. He has a whole lot of equations but a poor grasp of physics.
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