That proves my point even more then.
if you use a 0db test tone then you are around 6db away from standard music, which means that 1000w you supposidly run, now just turned into 400w at best.
using the -3db tone gets you tuned closer to what the music is recorded at.
Don't say a sub can take 1000w if you are giving it 400, it really cant handle 1000w.