ive read about the 521 lacking bass. It was design with a subwoofer.
try setting the speakers to large might give it more bass.
tama po kayo, the large setting will help, but if you have a sub, masmaganda ang small with abt 50 or 60 hz na xover setting para may overlap ang bass, imho, it sounds more full. Pero as mentioned, may preference talaga kaya magandang magtweak here and there.