I'm not exactly which "imaging" you are referring to, I know it to be the quality of depth and positioning that a speaker/acoustical environmental can produce. Meaning, how well it can create points in space that make almost know where different instruments are coming from, or providing a large sound-stage which makes it sound 3-D and lively.
My system? Complex to explain. My two front stereo speakers are kenwoods (forgot which model), but they have a 12'' woofer on the bottom and its a ported enclosure. They have cone mid-range and tweeters. Pretty large also, about probably around 5feet tall.
My Center is a KLH (cheapo), because I don't use it much.
My Surrounds and backs are custom made. Each speaker has a tower with 4-midrange drivers, 4 dome tweeters, and 1 supertweeter, all attached to a separate subwoofer enclosure with a 12'' woofer in a double-port.
Along with that, I have a two subwoofers. An Onkyo 8'' 100Watt (from an ancient HTIB I got it from, its surprisingly pretty good. My second powered subwoofer is a 500Watt 12'' Sealed box. Oh boy does it give a punch
.
So to summarize, excluding my center channel, I have 4-super-tweeters, 18-tweeters, 18 mid-range drivers, and 7x 12'' Woofers/Subwoofers and another 8'' subwoofer.
In my HT room, which is about 33ftx15ft, closed room, sounds amazing. I can play the entire system in a stereo at the same time, so when you stand in the dead-center, its like headphones.
Oh my AMP is a Denon BTW.