car audio help needed?

i have a crunch powerzone 1500.1 amp and 2 12 inch audiobahn subs 700/1400 watts i had everything hooked up fine and then i too it out and built a new box and i hooked everything back up the subs are wired at 2 ohms and i hooked it up and it sounded like crap no bass so i hooked up only one sub and it was fine. switched subs in that channel and sounded fine tried both in one terminal and sounded horrible again so basically the amp will in no way take both subs if only one is hooked up its fine plz help me as i kno a lot about car audio but this is puzzling me plz help
i kno both are wired at 2 ohms and nothings backwards
i had them both hooked up and workoing fine for months
ok the box is ported right amount of space and what i mean by the question is when both subs are hooked up there is almost absolutely no bass at all the subs still move the same distance and same air is pumped out of the box and this is the same box i had before i installed a new box which i took out and these subs were just fine b4 and now all of a sudden they dont wanna work
 
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