I finally did a grueling Keces vs uDac comparison using my Little Dot I+. It took me a little while to match the volume output of the Keces to be the same as the uDac because it did distort at higher volumes.
I’m using the following headphones:
Grado SR-125i
Grado SR-225 (classics)
Denon D2000
Songs (everything is in ALAC unless otherwise noted):
Bobby Darin – More (2004 Remastered) [253 VBR]
Blondie – Heart of Glass
Pete Rock & CL Smooth – TROY
Average White Band – Pick Up the Pieces
Boston – More Than a Feeling
Common – Be (Intro) [320]
Beatles – I’m Looking Through You (remastered)
Beatles – Get Back (remastered)
Guns N’ Roses – Sweet Child of Mine
Nas – Nas is Like (PREEEEEMO)
So far, the biggest difference is the way the Keces accurately replicates bass notes better. A difference I heard using the two Grados, but I was more acutely aware of using my Denons. The Keces also has better separation, I felt the uDac put a little too much emphasis with putting the vocals ahead of everything else.
That being said, I still like the uDac. It almost seems as though the biggest strength is highlighting the mids of most of the songs you listen to. It also is a bit more bright than my Keces. The only thing about it, is that when I switched between them rapidly, I’d notice that the Keces gave me a more balanced and fuller sound.
Another unrelated tidbit, I didn’t find the pairing of the HP out of the uDac particular strong with my D2000. I felt the bass was sloppy and unnerving. I’d much prefer outputing the uDac to my LDI+ if I’m using my Denons. The Grados sound good either way and I don’t mind using the uDac as the primary wayto my Grados.

uDac (left) vs Keces 151 (right)
I had some free time and spent the better part of the last three days comparing two Digital-to-Analog (DAC) convertors. I’d like to note that I chose to compare a portable DAC to a desktop DAC only to see if the term “giant killer” can stick with the small wonder known as the uDac. I’d like to note that sound can be difficult thing to review because in the end it’s subjective. What may sound good to me, may not sound good to others. I tried to cover a variety of genres, but ultimately I don’t listen to everything. Some of my favorite songs (punk and rap) were recorded in lo-fi, so I can’t possibly review everything I want. I fed each DAC to my Little Dot I+ headphone amplifier. A nice little audio budget-file product.
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