TPA 3116aD2 2.1 POP/Speaker Movement

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Hello! I am new to these forums and the DIY scene so bear with me.

I just recently purchased a 2.1 channel TPA 3116aD2 amp board and am using it to power a portable boombox i made. I have two 12v batteries wired in series producing about 25.4v to the board. Everything works great except when i power up and power down. I get a loud pop and the speaker cones flex pretty extremely in either direction. I was curious if any of you had a solution to this issue? Any help would be HUGELY appreciated.
 
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