The Skullcandy Skullcrushers Subwoofer Stereo Headphones in Black Pinstripe will literally pump the music right into your head! These power packing headphones feature an adjustable in-line bass amplifier and speakers with industry first built-in vibrating subwoofers. You can adjust the amount of bass effect with the in-line control wheel.
Josh Chester, check this answer both subs are not working and check for loose wiring or any burned components in your amplifier. You got to stat somewhere with the trouble shooting, so start there and see what you get. Hope this helps, good luck.