PC sound audio line amplifer ???

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http://androidforums.com – PC sound audio line amplifer ??? Ok to watch Netflix on our TV, we have it hook up to our laptop. both laptop and TV have a female monitor port and both have a reg 1/8 female headphone jack. right cable with two males ends plugs in both right, but the sound output from the laptop on some movies is not loud enough. Like I need some type of mini inline amp that runs off a 9volt or USB port to boost the auido before it gets to the TV jack. didn't have much luck yet searching??????? (General)