Greetings
Per a Stereophile review of the GFA-555 they list it at 22K.
Not sure if Adcom is still in business. It would be best to call them.
Joe Nies
Input impedance for Adcom GFA 555?
I’ve owned a pair of these amps since I bought them in the late 80s and now I’m adding a Vandersteen 2WQ subwoofer and to set the crossover I need to know the input impedance of the power amps. A couple Google searches lead me to an impass because I see both 100K ohms and 22K ohms listed. Note this is the original GFA555. Can anyone out there help me confirm the actual value? Thank you.