Also the 3DS earphone jack does 6.0 speaker surround sound, so make sure to have something like 7.1 surround sound headphones to fully enjoy the 3DS.
The Headphones I have are; Plantronics Gamecom 777
They convert the lower Surround Sound (3D Sound) into 7.1 Surround Sound (more better 3D Sound), and plug into earphone jacks, and theres a seperate Microphone Jack Plug that I just leave unplugged, LOL.
And the 3DS Speakerphones do Virtual Surround Sound, which is better then crappy Stereo Sound from other handheld devices of course.
Anyways, I hope you enjoy the awesomeness of your 3DS XL. The 3DS & 3DS XL with Surround Sound Headphones plugged in while having the 3D ON is just a Awesome experience. Make sure to go to System Settings in the Home Menu to make sure the Sound Settings is in Surround Sound.