I felt my celestion ditton 66s needed a refresh so followed another thread on another forum and the new caps are huge! (And expensive) anyway did the job myself and find the sound improved (tried it with one speaker done and one not). Also replaced the tweeters with seas units (one of originals was fuzzy) after looking at all the lengths people go to to replace diaphragms. Sound is a bit more top heavy but much more detail. Very happy overall with everything from pink Floyd to Beethoven!