There ARE small speakers that sound great. Size of the cone has more to do with loudness (volume) as opposed to frequency. It does take a larger cone to push bass (lower) frequencies for obvious reasons (bass waves are larger for one) ... but if the speaker is not rated to handle anything below 40Hz then obviously you're not going to get anything below that.
What you really want to pay attention to is what frequency range a speaker is rated for ... a sub should go down to at least 20Hz. There are subs that go deeper.
You also have to pay attention to the crossover frequency ... usually from 100-250Hz. It is at the crossover frequency that you get phase problems that could make your system sound weak. You have to tune it to the room.
Most computer speakers are crap. Because of many reasons ... not just cone size: component quality, enclosure, porting ... these are all things to consider if you are really trying to tune a system.
Then again, you're probably hooking it all up to a 1/8" mini-jack ... so you're degrading the signal right there. The best speakers in the world won't help you unless you have a decent signal.
Which brings up the subject of amplifiers.
It's just too much.
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