As always... YMMV. I own both the BD Xelento and the A&K T8ie MKII. In my case, I had the AK first, and chose to get the Xelento to complement them.
For my taste, with my music, and my equipment, I love both. I tend to use the A&Ks when I know I want to listen to EDM, Rap, R&B, and some Rock etc, where the music is more "fun".
The A&Ks are absolutely sufficient with any kind of music, but to my ears, the mid-bass can be a bit too much compared to the sound profile I prefer with other types of music. I generally use both IEMs them with portable sources, but they've both been used with desktop equipment.
For a long plane ride, the A&Ks are my go-to. I use an iEMatch with or w/o an adapter, and it works great with plane audio sources for movies. I use the iEMatch with an iPhone on full volume on Ultra and it sounds darn good. I also use iPhone to iDSD Micro (or Nano) BL and other DAPs. They both sound great on all, I don't think my opinions of either would change based on source.
Purportedly, but as yet unverified from any reliable source I can find, the AKs were tuned for AK DAPs. What I can say first hand, is that yes, they do shine with an AK 380. However, that DAP (to my ears and the ears of others) is known to be a bit "bass-shy".
This form factor (for my ear shape) is the most comfortable of all IEMs I've had the good fortune to try or buy. Tips can be used to shape the signature a bit, but in my case they are the least tip sensitive IEMs I've tried. No muss, no fuss. Medium or large stock silicon tips in both work fine for me. I personally don't like the included Comply tips, SpinFits or any other tips I've tried. That's just me and my ears...
Sound comparisons (to me) - using the exact same source material and amplification with a by-ear attempt to level match with pink noise and go from there... Not scientific, but hopefully helpful
Overall sound description -
- Both have what I'd consider a warm presentation, helped out by the bass presence in both.
- Soundstage - dealer's choice. For some live music, I think the soundstage opens up slightly with the Xelentos. Alison Krauss Live is magic with these. On the test disc, I couldn't reliably tell the difference, but I may try again.
- Bass The A&K is warmer, and pushes the bass up. The mid-bass on certain tracks with the A&K can be a bit much. If I have music that's more vocal present - for example Norah Jones' Sunrise - the standup bass at the beginning and throughout is a bit distracting and too present to me.
For Norah - Xelento's. For Usher - A&Ks. For The Who... Dealer's choice.
- Mids - I'd say the A&Ks
barely have slightly duller mids compared to the Xelento. This is a forced result, and I could change my mind tomorrow. I think both have exceptional mids.
- Treble - I prefer the Xelento's treble presentation. They have a touch more of that "sparkle" for cymbals, chimes etc to my ears and add a touch more realism.
This is with the same ears, same gear, level-matched (by-ear). I used some very familiar tunes along with Chesky's Ultimate Headphone Demonstration disc. All music was lossless 44.1, 96, or 192 through Audirvana (MacBook Pro) to an iDSD Micro BL.
For those considering the Xelento's. IMO, if I could only have one IEM balancing comfort and sound for all uses. It's it for me. However, comfort for me plays a huge role, and they fit me wonderfully. I have not gone the CIEM route (yet).
[Edit - Never knew space bar posted...] Finishing up
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