joe average improving things through electronic changes is little more than luck, though of course using better matched and specification parts can rarely lead to disaster.
damping the chasis and transport is almost guranteed to improve things, for minimal outlay and zero risk.
my cd player has 4 sq feet of dynamat strategically placed in it, based on nothing more than judicious use of a stethoscope, the results, quiter player, deeper and tighter base. something i couldnt have purchased and applied for the same £40.