I recently upgraded my TV and direct TV receiver, then moved a good for computer speaker system over to the TV... Night and day better than the cheesy speakers inside the flat panel TV, but I know it could be a ton better. (I recently turned the bass tone control all the way down and the computer speaker sub now sounds better, there was some odd artifacts coming from it).
I should probably buy a cheap AV amp to decode 5.1 and deliver 6 channels of amp. I don't need much power. Even the 180W hypex is probably too much.
The smallest Hypex module is 180W UCD180HG (70EU) so 6x plus conversion for USD $466
Then a hypex switching PS SMPS1200A180 1200W at rail voltages for 180 amp module 180eu or$200
So with shipping roughly $700 for modules that still need to be packaged.

I have 2 different pairs of decent hifi speakers, one needs to be reconed, but I already have the recone kit. I also have a big honking sub that has been sitting in my living room for a couple decades. So I only lack one full range speaker... and 6 channels of amp, and decoder...
Being cheap, I should probably buy a AV receiver with modest power. A couple I looked at don't directly drive the syb, but expect a powered sub.
Oh well... I know I can design and build an amp from scratch for less than $700, but probably won't sound as good as the hypex modules.
decisions decisions decisons.....
JR