So I am considering upgrading to the SR6500 from my current MM6 but am having difficulty justifying the $750 price tag. From those of you out there who have listened to both extensively, how much improvement would I get from the SRs? Just so you can gauge what I am looking for let me comment on what I like about the MM6. I find them to be a warm and smooth speaker (their transient response sounds excellent to my ear). I like the fact that they are not overly bright (except on a few recordings). I like their impact and excursion. I like that they are strongest in the mid range freqs which I am most sensitive too. I also like that they can sound excellent playing very diverse music.
Also, these will be installed in an extended cab truck (Toyota Tundra) in the stock locations (lower doors, A pillars) and driven off a head unit with time alignment and parametric equalizer and supported by a sub.
So convince I need these or at least give me enough ammunition to use with justifying to the wife.