| If I understand your description properly, it might mean that the centre of the bass top has sunk slightly under the pressure of the strings. Maybe the sound post is a bit short, or has been placed too close to the centre line, causing the top to sink.
Either way, if it's slight it's almost certainly nothing to worry about. If it gets worse, you need to get your sound post looked at.
__________________
It is not a 'cello my dear 1937 King Mortone, Lamberts Deluxe; 1938 Kay M-2, Guts/PsychoSlaps; 1968 B+H Excelsior, Guts/SilverSlaps
myspace.com/jump66blues; myspace.com/4stringsking |