Cap in a box?

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You know, I think a key factor in my test scrnario is digital. I hadn't A-B'd it with anything but my PC>DAC on the same circuit as everything else. Had it been all analogue, not sure it would have the same impact - maybe - but maybe not. I'll have to try it with some vinyl sometime, but since that photo above, I have hooked it up more directly to the power strip and tucked it under the component rack.
 
Blown puppies - so what exactly is this with blowing capacitors? It's running way under voltage spec, in a contained box - I have never heard of a film cap blowing up.
Ever wittnessed a motor capacitor blow? Believe me, the amount of smoke that it produces will never fit in that box of yours. Install that fuse, even better disconnect the thing when you don't listen.
I dare say any audible improvement because of this is due to a lack of good filtering in the device's power supply rather than blaming "bad, unfiltered" mains.
Exactly that. If your cap really makes a difference I would invest my time in upgrading the PS of your equipment instead.
 
As you can see in the product link, this is a cap originally developed by Siemens,
even has the old order numbers and is of very high quality.

Now, to clear the "blowing cap" issue up, is this part intended to be kept away
from mains voltage or not ?

The type plate does not show all of the familiar symbols, however IEC 61071 1/2
as seen here may be a guide, but I don't know it.
 
old HVAC guy here.. run caps can blow apart and make a real mess. some will go like a firecracker some will whistle.
Plastic cased ones can actually start burning aluminum out thru the case due internal arcing. (self healing feature) Most will just expand the cases like a bad can of veggies.