Originally Posted by zaina

A pair? so it's a 2.0 set (2 speakers and 0 subwoofer).

You will need a Receiver and 5.1 or 7.1 speakers to enjoy full high definition audio (you already own a good HDTV 1080p).

BigMike suggestion is good (Onkyo 805) and upgrade your speakers too!

Once you have all the components, connect the A3 HDMI to receiver and from receiver HDMI out to your HDTV HDMI in. This way you will get both hidef video to your HDTV, and hidef audio to the speaker set (also to your HDTV speakers but mute it).

You can use the HDTV speaker if you're watching cartoons.
But nowdays most cable HD channels are in Dolby Digital 5.1, at least in the US.