As the OP happily admits he has virgin ears and isn't (yet!) caught up in the need for ever-better sound, the simple answer to his question would appear to be a mix of Swampwalker's and Yogiboy's posts.
If the Audioengine A2 powered speakers can produce full output from an input of 9v (without being overloaded) AND include an attenuator for volume control, then this gear combo would work.
How it sounds is a question the OP may worry about later, as audiophiles tend to do. But first, we must set the hook by getting him listening to vinyl. There are many paths to the madness of vinyl-philia. Let's not close the door on any of them. ;-)
If the Audioengine A2 powered speakers can produce full output from an input of 9v (without being overloaded) AND include an attenuator for volume control, then this gear combo would work.
How it sounds is a question the OP may worry about later, as audiophiles tend to do. But first, we must set the hook by getting him listening to vinyl. There are many paths to the madness of vinyl-philia. Let's not close the door on any of them. ;-)