I bought a pair of 601 Series III new in 1988. To this day they are the worst purchase I ever made in audio. The bass was muddy, for what little there was. Imaging and soundstaging did not exist. I ended up getting rid of them to someone for $100.
There are far to many speakers that better these to even waste you time and money.
A shame, because just a series before, and you'd not be saying things like this, I'm willing to venture.
I was astonished how much I grew to love these speakers. Series 2