Pros: Lows, Mids, Highs, and Everything in Between.
Let me start by mentioning what great customer service Noble has. Everyone I talked to was very timely and helpful whenever I had questions or concerns before, during, and after my K10 purchase. This has easily been one of the best purchase experiences I've ever had. Noble, keep it up!
I am not an audiophile. My earphone experience is as follows: Klipsch S4 -> Westone W4 -> Noble Kaiser 10. I have always listened to 320 mbps + files out of my iPhone 5, so I have no experience with high end DAP's or amps, although these CIEM's have me saving for an AK240.
NOTE: Be careful! It's a slippery slope into the world of high end audio.
For a CIEM with 10 drivers, the K10 provides a spacious and cohesive presentation. Clarity is astounding. I am still amazed at how well this CIEM accurately reproduces recordings. Coming directly from the Westone W4, the K10 sound is on the thicker side and may take some getting used to, but once you do, you will never want to go back.
The K10 can hit like a champ, but only if the recording asks for it. Mid and sub base are spot on. I couldn't imagine any more, and I wouldn't enjoy (as much) any less. The base does not audibly bleed into any other frequency range.
The mids are "lush" (I didn't know what this meant until I had a listen). Everything comes through crystal clear and slightly thick.
The highs on this CIEM are incredible. They are sparkly, shimmery, and beautiful. Where other headphones struggle or are sibilant, the K10's reproduce high frequencies with no perceived effort at all.
These CIEM's cost 1600 USD! I was initially hesitant to buy them, but in the end they are completely worth it. If you are new to high end audio, as I was, the K10's will introduce you to a whole new way of your enjoying music. I've had the K10's since February, and my enthusiasm is still as strong as the day they arrived at my door.
I look forward to seeing how well these gems scale with a high quality source and will update this review accordingly.