What is the difference between the Bass Reflex Box Speaker in FJ series VAIO computers and those in the other models?

Difference between the Bass Reflex Box Speaker in FJ series VAIO computers and those in the other models.

The Bass Reflex Box Speaker in FJ series VAIO computers supports high quality sound internal speaker with bass sound playback.

Characteristics of the Bass Reflex Box Speaker:
- Makes midrange to bass sound big and high quality
- A certain frequency of the bass sound is absorbed in the speaker box and then reflected towards the outside again, which reinforces the bass sound
- Minimizes the size by placing the duct outside the box