considering the JBL PB10 sub to go along with JBL NPS1 package at JandR. As this is a floor firing sub and I live in an apartment with neighbors below, was wondering if this made any difference in terms of how it would disturb them (i.e. how loud I can put it without concern). does a front firing sub like the Sony WB40 make less of an issue here, or does it really make no difference? Thanks.