One of my infinity RS-8 subwoofer amp is hot compared to the other one. I checked the temp on the plate and was 142F. Theses speakers got a 100W sub amplifier bulit on each towers. 

I could see this was an issue with the amp going bad on these subwoofers. I am looking for any help to solve the overheating issue with the sub amplifier.

I am using the RS-8 subwoofer in my kitchen, but never faced such issue. How long do you play them in a single interval?