look, it got two build in subwoofer, normal pc 2.1 speaker just one subwoofer. currently i am using sony 7500watt mini hifi with two build in 20cm subwoofer. when i open volumn until half only, i receive complain frm my neighbour frm up stair, they told me their floor is shaking and i can feel my whole house door and wall are shaking. this is real hifi deep bass which is none of a computer speaker can deliver, nor even those RM1000++ logitech speaker(normally ppl praise logitech speaker bass powerfull). i never heard ppl praise GMX 2.1, mostly what i heard is the bass is boomy and bloat which is not true bass, its bass can loud but sound not nice. a real nice bass is tight and clear yet u can feel ur heart is follow it jumping.