Pioneer P-D70 – After the Model 1516 1980 prototype and its 4-channel surround-sound ability (backed by Philips until April 1981 but nixed by everybody else)…
After the original P-D1 in 1982, Pioneer went fully on its own with the P-D70… and sold many of them.
But upgraded it later into the P-D90 : black-faced, with an IR remote (CU-D90) and still retaining the mysterious “subcode out” connector. The latter was a Stereo Sound “Best Product” in the summer of 1984.
Among the originalities of both models : a binary digit / peak level switchable display
Revolution Sounds 