My subs are cancelling each other out

NaztyNate
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Wyoming
I have been into car audio for a couple years and know my fair share. I pretty sure I know whats going on but don't know how to fix it or if I can fix it.

I have 2 Infinity Kappa Perfect 12" subs that used to both be in .85 Q-Logic boxes. I recently purchased a thunder box 1x12" bandpass box and put one of the subs in that box. The one alone is as loud or louder as the two before and the SQ is not bad for bandpass, but when i hook up the other one too they seem to cancel each other out. The one in the bandpass is louder than it and the other one in the Q-Logic combined. I know there is enough power to them because they are each gettin 300rms and they take 350. Plus i have moved them both around in my trunk and it hasn't seemed to help.

Any help would be aprreciated.

 
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NaztyNate

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