Adding Morphit to the chain in "reference/correction" mode was a huge improvement for my personal tastes and needs, probably much better value for me than trying to buy better headphones.

It takes away the mid bass hump, moderately counters the deep bass roll-off, clarifies some parts of the spectrum that have a bit of "clutter", makes everything have a little bit more "bite" and "kick" while retaining that smooth natural timbre.

Bought them closer to the memories of the sound of some old secondhand Stax I had in the late 80's.

Free to try, so long as you have a VST capable player.

Other people's ears and tastes will vary though.