You would benefit from buying real loudspeakers and an inexpensive AV receiver.
I have Sony - KDL-40EX400 - 40" LCD TV and Bose Companion 3 speakers (with only 3.5 mm input). There is no pc jack (3.5 mm) on my TV, so I decided to use RCA out from TV to speakers (3.5 mm) It works great but I cannot control the the volume (or mute) using TV remote contol. Any solutions ? It is a right way to go ? is there any other better way ? Thanks