hey...a bit off topic, is that expresscard very good??
ive been looking for something to stick in that slot thats worth the price, what do you reckon??
and for some info in return, if i had to guess then that soundcard would simply improve the sound of the computer at the laptop's standard impedance which is usually standard at about 16ohm. what laptop you own??
my guess is the scl5 would work but it just would struggle to get very loud and wouldnt sound as great as a result. what you need to remember is the expresscard is not an amplifier so may not modify the impedance, however it may work like an attenuator and alter impedance that way.
by the way, this is a complete guess as i have no idea about the expresscards and i could be completely wrong and likely am. if i had some advice for you it would be that if you have not purchased the scl5 yet then dont, get the se530 instead, it sounds better and is strangely usually cheaper. also its 36ohm and will certainly work on your laptop.