The Yamaha SK50D contains a monosynth, polysynth, strings, and organ. It fills a space similar to that of the Arp Quadra. With dual keyboards and weight over 100 pounds, it's one of the heaviest synthesizers ever produced.
Year Released: 1980
Keyboard: 122 keys
Power Consumption: 60 watts
Dimensions: 1128 mm x 642 mm x 237 mm
Yamaha SK50-D ($2,249)