Ive got a Warwick 4 x 10 (600w 8ohm) and have had it since new in 2007 Anyway in the last 3-4 gigs, when I plug in my amp / bass etc and turn on to do a sound check, the top right speaker makes a farting sort of noise. When the farting noise starts I unplugged my bass, unplugged the speaker cable and plugged everything back in and turned the amp (Ashdown EVO 900 III) off and on, then it came right This farting sound only happens for about a minute then it seems to come right and does not cause any further problems only when I first go to use it. Im not sure if unplugging everything / turning amp off & on had anything to do with it, but it is totally weird. if it was a blown speaker or something it would 'fart' all the time wouldn't it? thoughts??