The Harman/Kardon HK Model 800+ is a quadrophonic receiver manufactured between 1974 and 1976 in Japan. This model offers a power output of 25 watts per channel across four channels, with the capability to be strapped for stereo use, providing up to 80 watts per channel. The unit is built with a 'joystick' sound-field balance control, allowing precise audio adjustments. It features built-in CD-4 demodulators and SQ matrixing, which were advanced for its time, facilitating high-quality quad sound without the need for external components. The receiver has functionality for connecting multiple input sources and can handle two tape sources or CD players simultaneously, allowing for a versatile audio setup. Additionally, it supports speaker switching for multiple outputs, enabling users to play audio in different areas. The original price of the HK Model 800+ was approximately $500. The build quality is noted to be very robust, making it a durable option for audio enthusiasts. Overall, the HK Model 800+ is appreciated for its blend of power, functionality, and sound quality, still impressing users decades after its initial release.

The Harman/Kardon HK Model 800+ is a quadrophonic receiver manufactured between 1974 and 1976 in Japan. This model offers a power output of 25 watts per channel across four channels, with the capability to be strapped for stereo use, providing up to 80 watts per channel. The unit is built with a 'joystick' sound-field balance control, allowing precise audio adjustments. It features built-in CD-4 demodulators and SQ matrixing, which were advanced for its time, facilitating high-quality quad sound without the need for external components. The receiver has functionality for connecting multiple input sources and can handle two tape sources or CD players simultaneously, allowing for a versatile audio setup. Additionally, it supports speaker switching for multiple outputs, enabling users to play audio in different areas. The original price of the HK Model 800+ was approximately $500. The build quality is noted to be very robust, making it a durable option for audio enthusiasts. Overall, the HK Model 800+ is appreciated for its blend of power, functionality, and sound quality, still impressing users decades after its initial release.