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Your Marantz Model 4430 is a high-quality Quadradial 4 Receiver developed by Marantz, a name famous for quality in the audio component industry. The Model 4430 incorporates Marantz exclusive Vari-Matrix circuit which simulates 4- channel sound from normal 2-channel stereo programs, and is capable of reproducing 4-channel sound from any matrix-encoded source. The 4430 wiil also reproduce any discrete 4-channel program as well as regular stereo and monaural programs. An optional plug-in decoder adapts the 4430 for any specific matrix system such as Columbia's SQ or Electro-Voice's Stereo 4. The FM Tuner section employs a FET for the RF amp. and MIX stage. The IF tuning circuit employs ceramic filters of wider bandwidth and higher selectivity to provide high sensitivity and unparalleled interference free capacity. The FM Multiplex Circuitry includes a stereo- monaural Automatic switching circuit, stereo indicator circuit and a buffer Amplifier to obtain output power at low impedance. An SCA filter is incorporated as well as low path filters for the 19KHz and 38KHz bands. Moreover the Model 4430 unit has a perfect muting circuit that permits pleasant eliminating FM Broadcast reception by completely inter-station interference which is usually generated at the time of selecting FM stations.