@dcaudio - I think you have completed the "simple test" just by listening to them. If they sound good then that is about as far as you can go - other tests require more sophisticated equipment.
However - if you want to make use of them then it’s worth considering the following...
A physical inspection of the foam or rubber surrounds will tell you if there could be a problem there - but they can be replaced if cracked or damaged.
Also - remove the woofer and take a look at the corrugated membrane behind the cone that centers the voice coil over the magnet - if that is damaged then I think it’s game over because at some time it will fail completely
If the speakers are over 25 years old I would recommend having the crossovers rebuilt - specifically the electrolytic caps - replacing them with high quality caps will improve performance.
You could also replace the internal wiring - the quality of wire has probably come a long way since they were built
I had a pair of 34 year old speakers on which I completed the above repairs and they are still going strong today.
Hope that helps - Steve
However - if you want to make use of them then it’s worth considering the following...
A physical inspection of the foam or rubber surrounds will tell you if there could be a problem there - but they can be replaced if cracked or damaged.
Also - remove the woofer and take a look at the corrugated membrane behind the cone that centers the voice coil over the magnet - if that is damaged then I think it’s game over because at some time it will fail completely
If the speakers are over 25 years old I would recommend having the crossovers rebuilt - specifically the electrolytic caps - replacing them with high quality caps will improve performance.
You could also replace the internal wiring - the quality of wire has probably come a long way since they were built
I had a pair of 34 year old speakers on which I completed the above repairs and they are still going strong today.
Hope that helps - Steve