I was digging out some paper work on my kit to have it all in one place and came across the manual and registration for my Kharma's . Bought brand new in March 2007 with a serial number GB 02 . Well time flies and these beauties or coffins as some of the lads call them are in their 15 th year of service . How long can speakers go on for before deterioration sets in . I do not play really loud levels despite what Caroline says !!!!