nice ICE you got.
i suggest you to get a good speaker sets for front and rear.
speakers does not have distortion but are not good at clarity too.
Try for rockford , helix , polk or infinity speakers. They are good replacements.
I hope with the basstube , you got what you needed.
personally i dont like basstubes. Woofers with custom made box sounds better and louder.
anyways basstubes are better when you dont have idea about making proper subboxes. Audio System Upgrade on Hyundai Verna Fluidic
We had lot of discussion about verna fluidic ICE upgrade here and many of them got good ICE upgrade in their car. you may find good info for any future upgrade there.
ya that's correct. basstubes dont give much vibrations in car but it just sounds more.