Hi, Have a set of Acoustic Research AR-5 speakers which were restored in 2016 by Human Speakers back east. The restoration included replacing all wires, tweeter and midrange controls, woofers re-foamed, new caps installed and binding post replaced.  A few days ago while listening to jazz music I began to hear static/distortion from the midrange driver of the left speaker and all of a sudden there was no longer any output from the midrange driver.  The speakers are 50 years old so I assumed that