OK. I see your point.
Still very case specific, to be honest. The Black Album is not very technical at all. Nor is it really a "modern" tone. Killer as it may sound for that record, try to do that 300 Hz trick in a downtuned fast-paced contemporary song where there is a pretty low-mid-heavy Peavey 5150 boosted with a pretty honky-sounding Tube Screamer, into round-sounding Mesa-voiced V30's and we'll see how well it works.