This is a so-called hometheater in the box, ie you just get all the thing at the same time.
The typical characteristics of all in one things is
1. Difficult/does not worth it to upgrade
2. Very limited way to modify/change the set as it's designed as is
If you want to do something to it, ie upgrade, one day, I would rather say you 'not' do it as it does not worth it or the improvement will not be worth your while.
This type of equipment is a beginning and an end to itself.
Buy it only you 
it 'as is'.Otherwise, it will be much more expensive in the future, ie you need to sell it and buy a better one to fit your requirement.
