problem with my DD mids bottoming out

[reed dollaz 10+ year member]

rms on them is 60, and 80 for music. my amp puts out 60x2. i have it set at about 75-80hz HPF, and the gain barely a quater way up and i can hear them bottoming out. when i take them out and play them free air, it does not do this. i dont understand why its doing this. any ideas

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[SQPL 10+ year member]

check the polarity.

 

[Side Show 10+ year member]

back off on the gain? turn loud off on the headunit?