Have you tried measuring dielectric absorption as well? This is a more sensitive measurement with most capacitors I see.
If you study the crossover schematic, you will find a simpler way to measure the capacitors, in circuit.
You might need to disconnect one lead of a resistor or driver. But you won''t have to remove the capacitors.
What is the average lifespan of that Schafners filtering cans caps made from X&Y caps seing the main, please !
Certainly good to know. I assume after a time they can introduce more harm than good ?
Simple. If they are really old, just replace them.
As Ray mentioned, much depends on how humid the environment has been through their life and how long they were exposed to humid conditions. I see many that are fine, and also wires heading to an area where a capacitor used to be along with scorch marks and everything in between.
By the same token, carbon composition resistors often go way out of tolerance, and not by a little bit. So you look at all old parts the same way.
As Ray mentioned, much depends on how humid the environment has been through their life and how long they were exposed to humid conditions. I see many that are fine, and also wires heading to an area where a capacitor used to be along with scorch marks and everything in between.
By the same token, carbon composition resistors often go way out of tolerance, and not by a little bit. So you look at all old parts the same way.
I don't think there is a given "lifespan" - however you should consider all X/Y-caps as "consumables". If you see older (I'd say befor year 2000) RIFA (transparent case), replace those no matter how they look. The IEC filter assembly rarely fails, IMHO. But depending on the running hours and your line noise, and your device, I'd give them 30+ years of lifetime. Plus the caps are contained, so even if they explode, they won't leave a big mess. A sole exploding RIFA on the other hand might leave your device in complete mess, with particles of paper/metal/plastic all over. Plus the awful smell.
I use the Rifa paper X2 (Kemet iirc now) as small value for loudspeaker filter only... if needed as I have plenty of another choices !
I always hesitated to use those EMI/EMC filtering gears for my DIY DACs (assembledno amps still). I assume a snubber on the PS side of the pcb was enough.