When Proac spkrs have drivers and xover operating within spec but overall are not sounding good.. #1 cause usually is the final amp.. incompatable, overdue for service, serviced but used cheap parts.. esp signal path coupling caps. Proacs driven by an incompatable Hot trans amp like Dynaco 410 are horrible. Plug in a smoother trans amp like Sansui Eight.. (not an analytical 9090db) suddenly you have better spkrs. Plug in McIntosh tube MC30 or 60 amps.. your spkrs strangely have improved. #2 has to be spkr angle, height (considering dispersion), spkr placement and room acoustics. E.g. Rear ported 2.5's against a wall = disaster. Hardwood floors, bare wallboard, no rugs, no drapes.. don't blame the Proacs. #3 prob the phono stylus... worn out, incorrect VTA, stylus pressure too light, cartridge alignment. #4 inappropriate preamp. #5 unblended thumping subwoofer... esp on 1SC's or tabbies. #6 Partner shouting "Turn it Down !" ... and #7 reason your Proacs sound bad.. your $pendy Pinot Noir is too Cold. Room temp in Southern France with fresh air flowing through the open windows can be 80 degrees or more... not your air conditioned 68.
Surround your Proacs with beauty.. and their magic will be released.