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Kubeek makes sense, if you overvolt a cap you can blow a hole through the insulator shorting layers, and thinking about it this would reduce the capacitance.
The caps most likely will last longer than the drivers.
One thing you can do is check for leakage, at the caps rated voltage, but for that you'll need a special gizmo, older tube era cap testers use a neon to check for leakage.
Thats assuming the caps are rated around 100v or more.
Doesn't need a special "gizmo", capacitor meters are Cheap on Amazon.
Don't expect calibrated values, But it Will spec the unit within reason (have one).
However, can't test them in circuit (duh).
On a bad day, a "good" multimeter resistance scale will show leakage.
If a cap doesn't show as "infinite", it may be a problem.
Most meters can't properly measure > 10 uF: charge time vs meter voltage becomes the issue.
Really Big value caps can be estimated by time x voltage rise calculation.
I mention Big, 'cause measuring the time is less sensitive.
I bought the cheap cap meter after having my Fluke give goofy numbers on higher values.
Good Hunting.. <<<)))
I referred to vintage cap testers as these can apply high voltages, this is probably necessary as crossover caps tend to be higher voltage rated.
You can use a high voltage source and a multimeter to do the job perfectly well.