is my subwoofer blown.?

is my subwoofer blown.?

ok so i have 2 10in mtx subs. i had them turned all the way up for a bit and then they both just went out. i turned the volume all the way down and back up again and only one of them came on. my friend told me to push the sub down and listen for a scrubbing noise. i didnt hear one.i took it out of the box and the wires LOOKED fine but i have no idea this is my first system and im not sure what i need to do to see if its blown. and someone mentioned a voltmeter but i dont have one of those. i turned the subs on and the one was playing and one wasnt so i pushed it down and it started beating but when i released it would stop. does anyone have any idea what is wrong. could i take my system to jc audio? could they check or do they not do that? PLEASE BE AS SPECIFIC AS POSSIBLE. thanks

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