The used market for the 66000 here on audiogon looks appealing, the thing is, I do not like the battery scheme for the cross-overs, it would seem if the battery's were half charged this may effect the over all sound?,Dkarmeli, how does the 66000 compaire to the M9500 you are talking about?, Kiddmann, Is it worth it to get a pair of the 66000 speakers on the used market over the K2's and other JBL's that are not the 67000 speakers?, The 66000 used market speakers are more in my budget than the 67000 speakers, do these speakers ever sound bright?, considering that they have 40 khz top range.