All I know is that when I play through my Shuttle 6.0 the high pass filter is around 60Hz. The low B sounds great for whatever reason. But maybe this is also the reason why too much B string playing gets really annoying. And super deep low end, at least in my experience, is mud and tone suck. I guess what I'm saying is that if we can't really hear the fundamental of low B it seems to be a really good thing for the sound of the band.
