You've shelled out good, after tax disposable income on a home theatre setup but instead of that room-rattling bass you've been promised you're only getting a thin gruel oozing its way to your ears. Did you get ripped off?
That's always a possibility, but even an inexpensive "home theatre in a box" can deliver good, room filling sound with chest thumping low frequency effects, so before you box it up again and toss it back across the counter at the retailer from whom you purchased it, take a while to do some tweaking to ensure it's performing to the best of its capabilities.