You know describing what you hear in a relative sense is IMO not the easiest thing to do because everyone has a different frame of reference , but here goes. Summits versus CLX, the Summits were a very very nice speaker with good imaging from top to bottom. I would even say the Summits are great speakers. They handle the high end like most MLs, but they have very good bass as well. The Summits also have very good mid range and bass combined and they seem integrated quite well. For sure they are the best ML has done in a hybrid format. Now with the CLX everything moves up a notch. When I compare the two, the CLX has even better imaging. The CLX is smooth throughout the range and has that same natural sound from high to low all the way through the mid range and bass. It is faster than the Summit and has completeness that must be listened too to believe. The mid range and bass are quick and clear just like the high end. Imagine the speed you hear when you listen to the highs on a ML ESL and then imagine that the mid range and bass have that same speed and clarity. The CLX is MLs best speaker to date IMO and they are truly amazing in their abilities. Instead of listening to music, you experience the music. Ultimately I would hope that every one with an interest, will get a chance to listen to their favorite music on the CLX and then they can make up their own mind.