try this soundcard

RM450?
Edifier C3
Edifier S330
Edifier R501MKII

that I dunno

If you using A5, thats not really an upgrade if you going for S330/S330D. An upgret should be like S530D and above.

S330 come with only analog input while S330D comes with digital and analog input.

I love altecs too but the new models had one major downside
they started to use low quality parts in it

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Added on March 3, 2011, 10:54 pm

if that buzz sound still appears probably your soundcard is the main culprit
get some earphones,plug it in to yo soundcard to check if the buzzing occurs.
meh... laptop soundcard sux
get a good soundcard

Try stay your signal cable far away from any main 230V power cord.

Is your signal cable got interfered by power cord.

Congratz for the purchase! Now, burn the speaker! 

just by playing music so the driver relaxes and eventually the sweetspot widens. i know this is controversial but this is my answer. you can either play music normally or use special software that produces wide range of frequencies for the speakers so it is faster. ultimately if you regularly listen to same songs with the same speaker, you will then notice the difference over time.

there should be no damage. it just takes up more frequency range then your songs. for subwoofer, you can use single frequency tone, but i prefer my foobar bass addition, because it covers more frequency range.

as I've mentioned previously... if the speaker makes sound... it's burn in

songs/movies/noise/etc... as long as the speaker is making sound it's burn in

Go for that 2nd hand Edifier S730

What moddification you plan on S530D? with RM160 

Do consider that Klipsch GMX, can save you some cash for a good sound card 

Forget it, its already sold. Go get that 2nd hand S730 

Audit

S730 win.

MX6021 gets the fun factor but it only lasts for a tiny moment...
S530D doesn't have the fun sound but with this you'll wanna use it like forever...

cuz in general fun speakers are fun not serious enough...

btw MX6021 is not worth the price

non stereotype... fully out from my opinion...

you can consider Aego M or Harman Kardon Soundsticks III also

i find no hissing sound with my S530D
even with shitty power supply I have only silence unless there's music...

that's probably because of the MX6021 messy trebles caused by the amp...
the trebles kinda reminds me of Edifier C3's messy trebles XD

well it's a fun speaker anyway...

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Added on March 27, 2011, 9:55 pm

yup... you can lower the chance by adding surge protector but with it you get slightly less power out of your speaker

Protection 1st, filtering noise 2nd