Without an expansion slot there is no external sound capability. 4.

FORBES: Connecting marketers to the Forbes audience. What is this?

The result is surround sound music without docking devices or external speakers.

BBC: Soundsynk

PhaseCue II - The new systems use ZVOX's proprietary PhaseCue II virtual surround processing to provide rich three-dimensional sound with movies or music -- without external speakers and speaker wires.

ENGADGET: ZVOX intros three new Z-Base models, lowers the pricing soundbar

Inspiron laptops feature Waves MaxxAudio technology optimized for Dell laptops to deliver studio-quality sound for watching movies and listening to music without the need for external speakers.

ENGADGET: Dell unveils Inspiron 14z Ultrabook, multimedia-friendly Inspiron 15R and 17R