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The radio constructor "Electronics E-20" (graphic equalizer) was produced from I quarter of 1990. From the "Start" radio-constructor set, you can assemble a high-quality equalizer (eight-band tone control) "Electronics E-20" for adjusting the frequency response of the amplifier via two stereo channels. Equalizer divides the entire frequency spectrum of the audio signal into eight bands, each of which is fixed at one of the frequencies: 31.5 Hz; 75 Hz; 160 Hz; 400 Hz; 1 kHz; 2, 5 kHz; 6.3 kHz; 16 kHz. The location of the engines on the front panel of the equalizer shows the approximate correction of the frequency response, which is provided by the equalizer and therefore is called "graphic". With it, you can improve the playback quality of stereo and monophonic phonograms, compensating for the distortion of the frequency response that occurs in the amplification equipment, as well as in the room where you are listening. Equalizer allows you to get the desired color and sound. With it, you can highlight the sound of various musical instruments, eliminate defects caused by aging tape and poor-quality recording. Equalizer can be used when listening to music programs and recording. It will help you create a lot of effects (for example, by raising the 2.5 kHz controls up, you will select the frequencies corresponding to the voice of the soloist from the spectrum of the musical program), weaken or emphasize the sound of various instruments. The model has an infra-low frequency filter with a cut-off frequency of 30 Hz to eliminate electromechanical feedback when listening to the player. It is formed as follows: electrical oscillations at the amplifier's output are converted into speakers into mechanical sound, which are transmitted by air to the music plate and the pickup head, where they are converted into electrical oscillations, which then enter the amplifier's input. The price of the radio designer is 22 rubles.