Kunstkopfstereofonie

In the article "sonant", else- where in this issue, a definition is given of a new type of "active" sound-reproducer design, in which the radiated sound (pressure) level is linearly dependent upon the electrical signal (voltage) applied to the input. This approach differs fundamentally from the classic `passive` loudspeaker system design, where electrical input power is con- verted - with limited linearity - into radiated acoustical power. Passive systems are either particularly poor in low-frequency linearity or else they are very bulky. On the other hand, active systems with good low- frequency performance can be quite compact. A practical realisation of the sonant-principle is to be found in the recent- ly presented Philips 22RH532 "Electronic". This article describes a few aspects of the way in which this sonant operates.