I've had a pair of British Monitor Audio floor-standers for a while now. I've been a bit lazy and haven't got round to filling them yet. Can anyone tell me, should I use sand or lead shot? Some people say lead shot because it's denser, others say sand because lead shot might resonate. Some say use both, but I'd rather just stick to one or the other. I've yet to get a definitive answer. I really want THE ABSOLUTE BEST from these speakers. Thanks in advance.