if its 'farting' an easy way to see if your enclosures are air tight is to push the sub in.. literally. carefully push it in and see how it bounces back. if it bounches back quickly, your enclosure is not air tight, if it bounches back slowly (like 1-2 seconds) your enclosure is air tight. now the only other options would be that your box is too small... and the air is hitting the back OR your subs are blown/defective/something wrong
if there is a leak, your sub will be throwing too far hence, farting, blowing, or sounding like crap. cuz the outside air is equalizing the inside air when it hits
I'm not sure about this but i noticed amps never post bridged on a 2 ohm load. are you on a 2 ohm load bridged? cuz that could be out of spec of the amp