Yamaha 1100U (1987)

Not much information on the Yamaha 1100U survives. What the period press has identifies it as the CDX-1100U, a compact disc player from 1987. Yamaha's own advertising in Audio (July 1987, p.67) claimed the machine "redefined the compact disc" with an 18-bit/176.4 kHz oversampling scheme. The company billed it as its Hi-Bit standard, a step beyond the then-current 16-bit/88.2 kHz norm. High Fidelity (December 1987, p.56), in a brief test report, described a proprietary Yamaha technique that bypassed the lowest two bits of the digital-to-analog converter when those bits were not needed for correct reproduction. It also noted the company's continued mastery of digital audio.

Beyond that, the record goes quiet. No full specification sheet, manual details or production timeline appears to have survived in the period press.