I own the 989's and have owned the 63's and the 57's. The 57's definitely have the best midrange I have ever heard as far as realism but where was the bass without a sub. The 63's greatly improved on the bass with an increase in volume level but again where was the bass? and the loss in midrange detail was noticeable. The 989's have quite a realistic level of bass, a soundstage wider than the placement of the speakers, much better imaging than my 63's ever had and an improved midrange although not to the level of the 57's. All told the results have been very gratifying.
