Introduction
The subwoofer gives this laptop a much deeper sound compared to other ones. This guide will show you how to replace it, should the original fail in your HP Envy 17-3070NR.
Tools
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            Slide the release latch away from the nearest edge. 
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            Slide the back cover off of the computer. 
 
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            Remove the six 3.7mm Phillips screws. 
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            Slide the back cover until it clicks, then lift it straight off. 
 
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            Unscrew the three 6.5mm Phillips shoulder screws that connect the subwoofer to the computer. 
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            Disconnect the red and black subwoofer cable from the system board by pulling it upwards. 
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            Remove the subwoofer by pulling straight up from the main assembly. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.