I guess I equate slam with the sound of Home Theatre-style speakers, those with a forward perspective and an elevated upper-bass and presence region, even if they are used for music reproduction. To me slam means physical impact on the body, which implies pretty loud listening levels; both of which---physical impact and very loud listening levels---are among the weaknesses of Planars. For me, one of the things I liked most about the first pair of Maggies I heard and then owned (the Tympani I-U) was the character of their upper-bass; huge waves of bass articulation coming from those three 72" X 16" screens per side. Way more slam to me than that produced by a relatively small diaphragm cone woofer.
Last edited by BDP24; 09-16-2014 at 10:12 PM.