Can I add a sub woofer to my dv7-1245dx if it didn't come with one

Question

I know this laptop is old, about 5-6 years old or so. I have blown one of the speakers in it, and am going to replace it, even though they sound horrible when working, it's better than 1 crackling while you try to watch a movie or something. Since I have to rip the laptop apart for this and another reason, I looked up the woofer that I know was an option for the dv7's, and I have found some I can buy. I am wondering though, since mine didn't come with one, is it just a matter of adding the woofer, or maybe there is no connection to hook it up? Doesn't make much sense to buy one if there is no connector to hook it up to. I know I have room for it, there is a round plastic spacer/cup thing on the bottom of the laptop where the speaker should be pointing out, I just don't know (yet) if there will be a connection for it on my motherboard.

Answer 1

Forgot Your Account Password
For Lion/Mountain Lion
    Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     When the menubar appears select Terminal from the Utilities menu.
     Enter resetpassword at the prompt and press RETURN. Follow
     instructions in the dialog window that will appear.
     Or see Reset a Mac OS X 10.7 Lion Password and
     OS X Lion- Apple ID can be used to reset your user account password.