Walang kaso kahit mas mataas sa 63v. Be sure to get at least polypropylene type, kung ayaw mo yung Wima ni Master Tony meron Audiophiler brand sa Eleshop. Perceivable or not, medyo maiiba tunog nyan after installing fresh caps kasi yung luma mo sigurado hindi na 4.7 ang actual value.
Tip: If you find the lower treble a bit harsh or overpowers the other frequencies, you may try a lower cap value like 3.3 or 2.2 uF. Bonus pa your crossover point will be farther from the tweeter's resonance frequency, a very good thing.
Addendum: Di ko nakita pic when I first opened this thread. Tama si Master Tony, bukod sa hindi naman sirain, it doesn't drift values much unlike the cheapo "lata" caps. Why would you want to replace?