The SC-HTB520 system delivers dialog that is crisp & clear. This is made possible by the Clear-Mode Dialog, which makes the sound seem like it is coming from the center of the TV display. With more precise linking of the picture & the sound, the result is clean, pure sound for dialog voices on video & vocals on music. Virtual surround technology also reproduces surround sounds from the front speakers that seem to wrap around the listening position. & dynamic, deep bass sounds are achieved by the Down Firing Subwoofer. The subwoofer is equipped with a wireless system, so there is no need to connect it to the main unit by cables. Lack of wiring keeps the room interior uncluttered & enables a simple & flexible layout. The slim, stylish home theater design is a perfect match for a wall-mounted VIERA TV. A stainless mesh material is used for the speaker net, & finished with a stylish mirror coating. The speaker unit inside is visible through the mirror coated net in this highly unique design. The SC-HTB520 is compatible with the Audio Return Channel feature. ARC makes it possible to receive audio signals from the TV, on top of the preexisting HDMI function of sending audio/video signals to the TV with just one cable. This feature simplifies connection by eliminating the audio cable connection between the TV audio output & the main units audio input.