Soundbar je zapravo zvučnik, samo malo drugačijeg oblika. Pogledajte veoma dobro objašnjenje o čemu se zapravo radi:

A soundbar or sound bar is a special loudspeaker enclosure that creates a reasonable stereo effect from a single cabinet. They are much wider than they are tall, partly for acoustical reasons, but also so that they can be mounted above or below a display device e.g. above a computer monitor or under a television or home theater screen.
http://en.wikipedia.org/wiki/Soundbar

Možda bi se moglo reći i samo zvučnik, ali ako baš morate precizno navoditi o kakvom je zvučniku reč, možda soundbar zvučnik nije loše rešenje. Pogledajte i ovu referencu:

http://www.lg.com/hr/kucna-kina/lg-NB2420A

Referenca jeste na hrvatskom, ali može da pomogne.