my hartsfields always worked great. you're plugging it into the speaker outputs of yoru amp right? not the ac in your wall?
LoL - just kidding. they DO have ancient crossover components - if it's just humming then it's likely shorting out or something and killing your amp. disconnect it immediately, remove teh crossover from teh back and recap everything ($$$) or at least remove each component and check it for basic operational ok-ness then replace each component. you know, conductivity, do the caps actually work like caps (irrelevant of them being accurate in any way still). the level control(s) may need severe cleaning.
but a hum sounds really bad to me - a speaker can't hum, but an amp can hum if it's speaker output is shorted out or something like that.
but also, if your amp just hums anyway, the hartsfield is INCREDIBLY sensitive and will show up any issues with your current amplifier and preamp (and sources).
still - I'd say disconnect it and check it for basic operation. and while you have the crossover out, try driving the main horn and hte woofer individually directly from your speaker output to make sure they make music. neither needs a crossover, just don't throw a lot of bass or volume at the main horn without a crossover on it of course. and if yours are the later or modded 3-way versions, don't even consider running the tweeter (called a ring-radiator in this particular speaker) without a crossover on it of course or it'll blow up.
if the speaker's toast but one or more drivers are ok, you can still sell it for a lot of money.
I sold my hartsfields for about $4000 or $5000 each I think a few years back. I just needed to change... I didn't have the space any more. it's sad, they were amazing, but I didn't have the gear to drive them properly either (not a lot of power needed, but definitely a lot of quality needed that I didn't have back then).
