Ok, let'* get started here. First off, you are dealing with a factory head unit that was only used durning MY1992 and MY1993, and you are using your experience with this head unit to call all factory head units (from other model years) junk. Secondly, the head unit in your car was (by your own admission) already failing at the time you aquired the vehicle. So, I would just like to point out that a failing head unit that was only used during MY1992 and MY1993 is not a good basis for calling a factory head unit from another model year junk, and is not even a good basis for calling the MY1992/MY1993 head unit junk due to the fact that the unit was already failing at the time you aquired it. Again, I am just attempting to point out a few flaws in your logic for calling the factory head unit junk.

Just because something sounds better than something else does not make that something else junk... You just went from "X sounds better than Y" to "Y must be junk because X is better"

since this is a car site, let'* put this in prespective.
A 1997 Pontiac Bonneville SSEi is better than a 1975 Honda Civic. A 1975 Honda Civic must be junk because a 1997 Pontiac Bonneville SSEi is better.

ok... bad example... here'* a better one.

A McLaren F1 is better than a 2003 Corvette Z06. A 2003 Corvette Z06 must be junk because the McLaren F1 is better. (see how this line of thinking doesn't work...)