I bet this has come up before, but a quick search didn't turn anything up. Anyway, I'm sure I'm not the first to notice that speaker cabinets, especially big sub enclosures, make great table-like surfaces on which to open your bass case, change strings, etc. My intuition has always told me to avoid doing this, however. Knowing that the pickups contain magnets, and that speaker cabinets (especially big ol' subs) have EVEN BIGGER magnets, it occurs to me that the pickups could potentially be adversely affected by proximity to (relatively) powerful magnets. Maybe not from the occasional case opening on top of a sub, but over time, with prolonged and repeated exposure, perhaps? So, is my intuition right or wrong?