Go for S330, you will be impressed with its bullet tweeters 

Price around RM400 

Hmmm, Keep a little bit money to get a better one, The s530. Overall more balance sound. If U dun care bout the warranty void, mod the inside opamp to AD8066 ^^ S530 is priced at RM799, for C3, If u can mod the woofer then it'll be good ^^

If U want a better sound, buy the C3 and mod the AMP for better output to the woofer. After that open up the woofer change the wiring connecting the woofer speaker to a better one. It using lousy red/black wire (the ones we use for primary school Kemahiran Hidup light bulb wire LMAO). The Amp has NE5532 OpAmp, not bad for stock. If U want a Brighter sound, with more treble, change to LM4562/LM49720, or U can try AD8066 in DIP mod. 4convenience, solder the socket to the board for future OpAmp change, so that U can change the opamp when U get tired f the sound. And change the cables U use for the speaker (AMP to speaker) to a better quality ones. Did u use any soundcards?

Hmm, I think LM4562/LM49720 price is at aroud RM30, and AD8066 modded to DIP RM50, Rm30 for the chip and RM20 for the SOIC to DIP socket, since AD8066 only has SOIC models. Cables depends. If you really need very very good quality ones, it's priced at RM50/meter. I think the Rm30/ meter cable is good enuff. Try Brothe Xtreme, he has modded soundcards, speaker boards U hav to find out, mayb his 1st project ^^ XD. Hmm, for DAC U can try get a headphone amp and use it. Since it supports USB. Try FiiO.

If willing to DIY, try learn soldering 1st, until you're good with it then start modding your speaker. If not then you need to ask around anyone who had experience on modding the same model you owned.

C3 or S330, both speaker cable can easily replace one, i recommend Cat5e also network cable for cheap and very good sounding, try find good quality such as Cliptec or AMP Interconnect one, cheapo network cable spoils quality only.

A video of my speaker, after so many itchy hands on it.

Yes, it is Edifier sound signature 

Enjoy your C3~ 
Remember to run in by playing music at normal listening volume for certain time after that go loud.

If you would like some real hard run in, what i experience best is 200hz for mid range, 6khz for tweeter, 50hz for woofer using frequency generator. All these 1st need to cover up your satellites with some soft cloth otherwise you'll scream.

I had wolfson dac from chchyong89, not a bad one but i found it has high frequency roll off, the higher the frequency the lower the amplitude. 

Yes, good preset = no preset 

My personal experience any preset just spoils the sound, but the resampler can use if you are on WASAPI or ASIO output.

Fujitsu=LOL?

the polyfills method?