I redrivered and spiked the Frieds three years ago while spotting them optimally in my room. Ditched the equalizer.
Went from a somewhat floppy equipment stand with sides and glass door (and, of necessity, a cooling fan) to a spiked Sanus open rack with 60# of steel shot and 40# marble slab under turntable. ("just like a great big dead fall hammer . . . ")
LAT International silver interconnects and speakers cables and CAIG cleaned and preserved all contacts.
Analog frontend replacement with Rega Planar 25/Glider L2 and VPI 16.5.
Digital Frontend replacement - work still in progress with Denon DVM-3700.
Sennheiser HD600 for home and HD590s w/ porta CORDA to go.
JR Power conditioner, hospital grade outlets, unplugged everything from pre-amp convenience sockets and into their own "real" outlets, and moved room lights (w/ rheostats) to another circuit.
Now that I can hear the signal source clearly (my wife has accused me of buying all new vinyl and CDs; there's your proof!), I'm in the process of retiring the REALLY bad recordings.
Since audio reproduction improvement in a progression limited by knowledge and technology, the biggest improvement I have made is to commit to learning more, find new sources of objective information, and make reasonable improvements after the R&D has been paid for by somebody else.