[ddouglass]

Headphones out and line out are not usually the exact same impedence but both are low impedence which is suitable for input to an audio amp.

For the video "dual out" doesn't always mean that it is capable of extended desktop. It could be duplicate out meaning what is on one screen will be on the other and that isn't what you need. That is why I said check with HP on that spec.

Most of the KJs who use a laptop have an external HDD to store there song files on because it makes it easier to go to a backup machine in case of trouble. It also keeps the internal drive clean and functioning at peak efficiency.