Reading many of the reviews on here, they recommended to use these headphones for at the very least 24 hours straight before giving them good field use. Turns out, they're all correct.When I first bought the Image S4's at a local best buy, they sounded "pretty" good out of the box, but they also sounded pretty painful in certain frequency ranges -- in the treble most notably. "S" and "ch" sounds in lyrics would punch my ears in the face and make me wince. Songs had a certain shrilling tinny quality to it, that was definitely not comfortable. Well, I left the S4's on my desk plugged into my Zune HD overnight, playing music at random. About 18 hours later, I can already hear a massive appreciable difference in the sound quality. The treble has softened back to a beautiful balance with the mids, no more shrilling pain from lyrics, and the bass has solidly found its place without trying to overpower the whole track. At lower volumes, the bass, mids, and treble are easily audible and full -- which was not the case before, where the bass would drop out, and the treble would overpower the mids.My opinion on the S4's went from "If things don't improve, I will return them," to "FOUND A KEEPER HERE." -- And that's only with about a three-quarters of a day worth of burn-in! Most people recommend at least two to three days worth of burn-in to get the truly wonderful sound these headphones are capable of producing. I'm interested to see just how much they'll get from here in the coming hours.Elsewhere, the S4's fit my ears superbly. The oval tips on the buds fit perfectly into my canals. I don't get any discomfort from the build of pressure as I push them in -- the design seems to allow excess air to escape very well. This also means that then I put them in, I've yet to hear the speaker "crinkle." The other nice part about the oval design is that if I pull the muscles around my ear to make my ear stretch upward, the seal on the buds are not lost, which always happened on my old Lenntek Sonix. I would have preferred to have seen a braided cord on these, and the buds made from milled aluminum billets to really add some durability value to these, but they're quality isn't lacking as-is. The cord feels a bit thin, (not weak, just thin,) but at least klipsch added some of the best stress-relief shielding I've seen on a pair of buds. You won't see your cable weaken and drop signal on these for a long, long time -- if ever.I've trusted Klipsch before to impress me with my choice of desktop / entertainment center speakers, so when it was time to get new headphones, I thought I would place trust on them again -- and sure enough I'm not disappointed. 

Question: How is the bass?
Answer: the bass has solidly found its place without trying to overpower the whole track