Vizio S4251w-B4 review: A sterling sound bar for surround-sound
devotees  Features: Bluetooth, Dolby/DTS, and more  Vizio
S4251w-B4 inputs (Credit: Sarah Tew/CNET)  The S4251w-B4 also
has built-in Bluetooth, which is pretty much a must-have feature
for sound bars this year. Bluetooth is the easiest way to
wirelessly stream music from the vast majority of smartphones
and tablets. There is compression with Bluetooth audio, so there
is some sound quality lost, but it's less noticeable from a
sound bar than a system with separate speakers.  There's also
onboard Dolby Digital and DTS decoding, which isn't essential on
a sound bar, but can come in handy in some situations.
Unfortunately most TVs "dumb down" incoming Dolby Digital and
DTS (more on this later), so if you're using your TV as a
switcher, you'll rarely take advantage of the built-in surround-
sound decoders.  Speaker setup: Strictly DIY Since the S4251w-B4
is technically a 5.1-channel speaker system, you might think it
would include some type of automati