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.
thoughts on the bose 501 speakers
before i bought my bose 901 seies 2 speakers, i had the 501's! any comments on this model??