g_yakamoto:
The reason 901s were often underpowered is because in 1971 a pair of 901s plus a Phase Linear 400 plus a separate preamp would cost the equivalent of over $8900 in today's money, a bit steep for a college kid, or even a young professional. Just the Bose 901s plus a good receiver would be a lot of money by today's standards (about $5300).
Back in the 70's, i read that you should have at least 100 watts per chanel for these speakers.Yep. I would say 100 wpc in a high current amp would be the minimum, and 200 wpc is better. It's telling that Bose's own amp was 250 wpc into 8 ohms, 400 into 4.
The reason 901s were often underpowered is because in 1971 a pair of 901s plus a Phase Linear 400 plus a separate preamp would cost the equivalent of over $8900 in today's money, a bit steep for a college kid, or even a young professional. Just the Bose 901s plus a good receiver would be a lot of money by today's standards (about $5300).