If I understand "bigger sound," then louder is not the same thing. More watts will give you louder, but not bigger. To my ears a big or full sound is accomplished with a balanced, flat frequency response. Too often speakers have a boosted mid-bass and lower treble. This causes the upper bass and lower midrange, the "meat and potatoes" part of the spectrum, to sound relatively weak. Making everything louder will not flatten the response.
Some people equate bigger/fuller to a more resonant sound that 'fills' in the gaps. Either way, I think this is a speaker issue, not the amp. Take some time, do more listening to other systems and speakers. This will help you learn how to get the 'big' sound you want.
Some people equate bigger/fuller to a more resonant sound that 'fills' in the gaps. Either way, I think this is a speaker issue, not the amp. Take some time, do more listening to other systems and speakers. This will help you learn how to get the 'big' sound you want.