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Lots of active BBC monitors and Spendors with amp packs from Quad and other UK brands into the 70s. First true active was the OY from Klein Hummel in 67. Jbl did powered speakers in 64.
Although I don't know how many of those were active, i.e. with electronic crossovers, or just had an amp pack on the back or underneath on the trolley. KEF had a 'Professional Monitor' with amplifier under the 'speaker, but I'm pretty sure the crossover was passive. OMAL and Tangent were also early actives as I recall.