Klipsch and Capacitors

@maprik ,  I have to ask.  How did a pair of KG4s go unused for 40 years?  I have 2 pairs BTW.

If it was me ALL the old stuff inside would be replaced with modern components.

Crossover

Terminals

Wire

Add additional dampening if needed.  But heck, that's the way I am.

Hello maprik!  Almost every company uses cheap parts in their crossovers. Replace just about everything in the crossovers, except maybe the board their on, with high quality parts.  Avoid ferrous metals anywhere in the signal path, including the connectors on the speaker wires. Test everything with a magnet, even the nuts and washers on the binding posts. It may sound exteme, but you will be pleasantly suprized if you do it. Be prepared to spend $100 or so for each of the left and rignt speakers. (If you have a surround sound system, do 'em all as finances allow.)  I recently upgraded all the steely bits in a four way system and was stunned at the improvement. Enjoy the music!

An old UNUSED speaker in a box for 40 years, wow...

if you are handy, i would replace the Caps with Mundorf with the same value

and might as well replace the resistors too (Dale) and listen.

But as others have recommended. Listen to it First for at least 24 hours and notice if there is distortion or any anomalies in the sound. once that is Good to go, then do the parts replacement.

just my 02cents 

@audiostick Apparently the owner owned 2 pair. His son who is a good friend recalls KG4s being in their living room for as long as he can remember. His father passed away and in preparation for the Estate sale he found the unopened KG4s in the attic. Im considering purchasing them.