Can i modify creative 2.1 sub with any other replacement subs.. the max out of the current woofer is 17w and total peakpower is 29w incl the speaker. Can i change the subwoofer to 40w ? If so will i get the power of 40w sub ? Plz reply asap
You can change the woofer but it may sound worse and play lower in volume.
Speakers don't have "watts" they have a maximum recommended power to drive them. If you replace the existing woofer with on that can handle more power it won't get more power since the amp can't do that.
If may actually play lower than the original speaker because the combination of speaker and cabinet may result in lower efficiency.
If you want better sound buy a better speaker system.