For sale is a rare Japanese-made Pioneer RG-9 Dynamic Processor

The dynamic range of the music source can be expanded by employing the RG-9 as a stereo system adaptor unit. No preprocessing is needed & only ordinary program sources, such as records, FM broadcasts or tape music, are required

The dynamic range is broadened by upward and downward expansion, resulting in a powerful and sharp rendition of the source. This has the effect of bringing performers right into the listening room, and especially pulsive sources such as rock and soul are given a broad new dimension

Attack and release characteristics of the audio signal are preserved by a fast and slow. response (mixed) double action control signal that prevents unnatural impressions in the reproduced sound

A noise reduction effect is also included which reduces underlying source noise. Tape hiss, motor rumble and other background noises are reduced by the circuit properties of this unit, so that low noise, exciting stereo sound can be enjoyed

The sensor section which produces the control signal is provided with an energy distribution filter, to ensure that the expansion function is not trigged by noise components. However, expansion is not limited to instruments, whose fundamental frequency is close to the center frequency of the energy distribution filter, since all musical instruments produce harmonics which are strongest when the instrument is played hard. Hence these harmonics activate the sensing circuit and control the degree of expansion, so that lower frequency instruments are also enhanced

The expansion in the dynamic range can be switched in 3dB steps from 4dB to 16dB with this 5-setting selector. It is possible to produce the optimum expansion in the dynamic range and also to select the expansion according to the music source & your individual taste

The processor has been slimly designed with the dynamic expansion meter, which employs a Fluoroscan display, in the center for a clean, fresh look

Also comes with the user manual