"...I have Series 1 and 2 901's that I bought used for my 5.1 setup. I think they were and still are their finest product..."
Series 1s were the best of the bunch. They may have been their best product but they were not the best loudspeaker in 1971 or any of the following years.
The 501 had the biggest cabinet and the largest bass driver in the bose line so it does have the warm full sound that a lot of bose speakers do not have so i would have kept them for a different type of sound compared to the 901 just for a change of pace sometime.
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