Replacement capacitors exploding


I replaced the capacitors in the crossovers in my Klipsch KSM-1 stage monitors.
There is a capacitor that runs parallel to the woofer which had blown in a couple of my dozen stage monitors. They are from the 90s, which is not ancient, but I figured maybe that age is a factor so I swapped them all out.

The replacement capacitors have all of the same numbers printed on them but are a fraction of the physical size, and in just one season almost all of them have blown. I don’t think they were being pushed harder.

Is there a way for me to order capacitors with the same specs printed on them that are also heavier duty in some other way?
jamesheyser
I had a similar problem at work.  The caps would just open.  They looked to be electrolytic, just physically much smaller.  When I opened one up, it was hollow with a tiny chip inside!  
The voltage rating is too low. Poor quality capacitors. Replacement caps installed are not Non-Polarized.
Upon closer examination, the old capacitors say NP and the new ones say BP.

I’ve been searching for non-polarized capacitors and I have found three different sites where the item description says non-polarized capacitor and then the photo is of a capacitor with BP written on it, not NP What is that about?
BP should mean Bi-Polar. They SHOULD be the same... Try to find Non-Polar, think the last time I bought some NP caps was on Mouser Electronics. I'll check later to see if they are NP or BP. What are the voltage ratings of the new caps and what brand?
What is the value and voltage rating on the caps?
Also,  I suspect that you have an DC Offset issue with the amp being used.