I’m just shooting in the dark here but a lot of those speaker cabinets from that era, Eden, Aguilar, Peavey had this mid scoop thing going on. Which made the bass more pronounced as the midrange voice that carries more of the musical information was subdued. So the bass end of the spectrum is more strident and it does sound better if observed close up. As one gets further out in the room, the audience’s perspective, that kind of tone is buried in the wash of everything else because that midrange carrying the bulk of music information is not as present.
Again that is why that deep bass sound sounds good at home but doesn't cut through on stage in a band setting. Whereas a fuller range speaker system may sound harsh up clise but when it reaches its destination, the audience, it is all present and balanced.
Remember…
Bedroom sound
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Live sound
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