I tried looking up the the model # and a couple of sites that would sell it but cant find any. Also the player is like 2 years old so hard to find anything about it.
9v is what's called the 'nominal' value, or typical value. Input voltage can dip as much as 20% which would drop 9v down to 7.2v, but is still enough to operate. (If you only supplied a nominal 7.2v, and line voltage dipped 20%, you'd be left with only 5.8v trying to operate a 7.2v system. Not enough.) Basically, every electronic device contains a voltage regulator. Anything more than the minimum is shunted away, but if the input drops, then there is still enough to maintain the minimum voltage necessary to run. But you still need a nominal value higher than the minimum to make sure there's always plenty, no matter what happens.
What is the question here? Are you looking to buy a replacement power cable? One of the multi use ones would work fine, set it for 9 volts. The other important part is the current rating (amps or mA). What does the DVD player say it needs? Make sure the new power cord can supply at least that much. Voltage: try 9 first, if not work then try 10 or 11 or 12. No higher than 12. Current: the same number or higher than listed on the player.
