Two inexpensive reversible DIY that may make a big difference:
Remove the speaker connection plate and wire around the fuses. To me, this increased the mid and high range resolution and broadened the soundstage.
Also, get them off the floor. Some use stands, but I simple constructed a mdf base with feet to lift them about four inches. The bass tightened and the additional height brought the speakers into focus to my listening position.
I have also switched out Sonic caps for the OEM caps, but noticed little difference.
Good luck.
Remove the speaker connection plate and wire around the fuses. To me, this increased the mid and high range resolution and broadened the soundstage.
Also, get them off the floor. Some use stands, but I simple constructed a mdf base with feet to lift them about four inches. The bass tightened and the additional height brought the speakers into focus to my listening position.
I have also switched out Sonic caps for the OEM caps, but noticed little difference.
Good luck.