Most speakers sound better after a break-in period. Usually it's not that noticeable in a car because of outside noises like engine and road noise overwhelming the detail. The Ariya is pretty quiet inside though and I also noticed an improvement. I also notice the improved sound when playing from SXM or my own rips on a thumb drive.A friend who is really into car stereo system once told me new car speakers will get better over time. This was due to the speakers getting their cones broken in where the seals have a chance to losen up. The tweeters and mid-range may be electronic but the woofers and cone speakers should have seals around the cones. The source also has an impact on the sound. FM radio has a slight scratchy sound but streaming from my phone on well recorded digital music sound better. Sirius is the best but don't need another subscription bill.
For my Evolve+, the bass sound a little better than when I first got the car. I have been playing the sound a little louder than normal as I have the sunroof and windows open. Overall the sound experience has improved. Does anyone else hear a difference?