Pioneer SPEC-1
Pioneer SPEC-2

No need to present those - still one of the most sought-after powerhouse combo of all time.
Very closely related to the Exclusive C3 and Exclusive M3 which would give way to a bestselling lineup (in Japan) with the Excusive M4, M5, M5a and related preamplifiers. The early 1990s Exclusive C7, Exclusive M7, Exclusive V7 and the xxx-rare Exclusive M8 weren't as successful but still made for a 20+ years lineup which started in 1973 and ended in 1994.