Use different capacitor for subwoofer
&quot;MISUDA&quot; -- that's the brand name, it doesn't matter.
6800\$\mu\$F -- that's the value, it's important. Match it if you can, exceed it by as little as possible if you can't.  (That's a common value -- you can match it).
50 VDC -- that says the capacitor must withstand at least 50 volts DC -- which means that it's exposed to no more than 50VDC.  So a 63VDC cap will be OK.
-40 +105\$^\circ\$C -- that's the temperature rating.  It says the capacitor works OK within this range.  You really want to meet it or exceed it on the high-temperature end; you can go higher on the low-temperature end as long as you don't let your speakers stay out in the cold for too long.

I suggest you avoid Amazon for any technical parts.  Cheap teacups or even computer monitors -- yes.  Any component where performance matters -- no.  Check with a distributor -- DigiKey, Mouser, or Newark in the US, Farnell in Europe, and I don't know who to suggest elsewhere (sorry).