I had a pair of CLS years ago. They needed a new set of panels. The design is such that dust will eventually settle one the panels reducing the efficiency. I bought a "B" grade that had a slight defect, installed them and they were definitely easier to drive.
I think the design actually had something that cut the power to the panels when music was not playing so they would not attract dust. I still miss those speakers...I keep looking for a local set of the CLS.
It's just the nature of the beast though - you are eventually going to have to replace panels on them.
P.S. Now I have a few sets of the original quads (again). They are nice because they have dust covers so will not have the dust on the panel issue. The CLS design is nice, never hesitates to generate a "wow" visually instead of a "what" from visitors
I think the design actually had something that cut the power to the panels when music was not playing so they would not attract dust. I still miss those speakers...I keep looking for a local set of the CLS.
It's just the nature of the beast though - you are eventually going to have to replace panels on them.
P.S. Now I have a few sets of the original quads (again). They are nice because they have dust covers so will not have the dust on the panel issue. The CLS design is nice, never hesitates to generate a "wow" visually instead of a "what" from visitors