I mostly Play my Paramount 3/32 Organ through my AKG 701 Headphones,
from my experience if I increase the Bass level loud enough to balance the uppers, then the ultra Highs of the glockenspiel Intermodulate with the bass notes, resulting in unnatural distortion !
I feel that, a "Buttkicker Shaker" mounted under the bench seat,
with rubber isolaters under the bench legs, and with suficient amp. power, would improve the realism when using headphones !
Aside from Headphones !
I rarely use my present speaker grouping of 8 Behringer B2031A's,
plus one 18" Commercial Sub, which provide an enjoyable Instrument to Play for my purposes !
Mel