Standout back in 2013 was the AK100’s USB DAC capability. The original AK100 worked exactly the same way. Plug it in, wait for the charging indicator, then depress the mains button. Your choices: DAC, Charge, or data transfer, are simple and foolproof.
Jr’s USB transfer speed, however, is insanely slow. A 500 MB ALAC album takes about two minutes to download to the player. My 2011 iPod will transfer the same album in about 30 seconds. Dumping 32GB of random albums onto Jr took an hour and a half.
In three unloaded mixed-format tests, AK Jr averaged 7 hours, 33 minutes of run time. When playing DSD files, that number drops to 5 hours and five minutes.
NOTE I: DSD battery run down tests were conducted only twice before they were averaged.
NOTE II: This is a demo unit. It is possible that its battery isn’t optimal.
Jr looks great on paper and on computer screen. It hurts in the hand. But, once you cue up the song/album/artist you want, dim the screen, and unwind, it does what it is supposed to do: play music. To the techie music lover, its complete rocking of the WM8740 chipset makes up for its many shortcomings. To the just-want-to-enjoy-my-tunes music-lover, its UI-related flaws really need a fix.
Performance and sound
By the numbers, I would expect players costing thousands more to walk all over Jr. And while both the AK240 and AK380 can and do outperform Jr in a number of measurable areas, I’ll be damned if you, or I, can hear most of them.
Sound signature, however, is another thing.
Jr has this warm, dry thing going on that stands distinct to A&K’s latest DAPs. The AK380, for instance, is more contrasty. And since I called Jr ‘dry’, I’ll probably should call the AK380 ‘wet’. Of course, both adjectives oversimplify reality, and draw distinction to nearly hyperbolic lines. That said, the comparison stands. And for its sake, Jr is warm and dry and AK380 is contrasty and wet.
Jr nails the authoritative, muscular sound for which many Wolfon DACs are known.
It is coupled to a practically hiss-less output that is perfectly suited to sensitive earphones such as the Ultrasone IQ and the Shure SE846. It outputs about as much hiss as an iPod nano 7G and just a bit more than the Calyx M.
Jr’s volume range arrays itself over 150 steps, labelled in half stops from 0 to 75. Finding the right volume for your earphones, or your headphones, is as easy as pie. And unlike either the AK380 or AK240, maxing the volume (or setting it to line out) doesn’t result in audible increases in distortion. Both the AK380 and AK240 suffer from intense, ratcheting IMD and THD, that, even when driving unloaded signals, can result in audible shearing and sizzling. If you’re going to use outboard amps connected via line out, Jr is far better suited.
Or, you could lower the volume of either high-end AK device to obviate distortion. Doing so, however, nets compressed dynamic ranges, stereo separation, and more.
But let’s get back to music.
When feeding my Ultrasone IQ something from Armin whilst sipping gin on my porch, I’m most comfortable tuning Jr to volumes between 20 and 24. Whilst sipping from a snifter on the train, or airplane, I bump it up to a maximum of 35. And naturally, Jr is perfectly balanced in both channels from the getgo.
The sound stage Jr throws is wide and tall wall, a wall-of-sound that maximizes surface area in lieu of ploughing deep z-axis fields. That wall of sound starts from the centre of the head and moves out by dozens of centimeters on either side and about ten centimeters above the head. Like the DAC that drives it, it is dry land muscular.
And yes, that sound stage is an audible upgrade to the original AK100 and to the iPhone 4s. Its warmer signature reminds me of the original iPod nano. Except its output is much less hissy, and its line far cleaner and its headphone output far better able to handle varying loads.
Astell & Kern’s marketing literature suggests that Jr’s output impedance is 2Ω. It handles hard, high-current loads well but not perfectly. Its most obvious artefacts are, small treble rises when paired with earphones with wildly swinging impedance curves such as the Earsonics SM2. That said, the differences are so minute that I doubt anyone reading this review could suss them at the ear.
Unlike Apple iPhones and iPods, it blasts way, way beyond the 110dB barrier of dynamic range, stereo separation, and noise. While it appears to post THD and IMD levels about 10x higher than the AK380 and AK240, I will again argue that the levels detectable by the Lynx HILO (~0,036%) are inaudible. Under hard, high-current, low-Ω headphones such as the Audio Technica ES7, THD will max at of over 1%, and may be audible to some.
Overall, Jr impresses. Its output is strong all the way up to 75. And it gets loud, and bides very little distortion. It is warm, dry, and perfect for trance, EDM, classical, jazz, vocal, and John Denver. If you’re heavily into motion picture soundtracks, or strongly emotive genres, who knows: you may enjoy Jr as much as I do for the stuff I enjoy. And you may have a different headphone setup. All I can say is that this thing is well done.
Jr’s equaliser is five band. It sidesteps sizzlies by lowering amp gain by about 3 decibels prior to making any audio adjustment. Bass appears not to distort when set to maximum, but treble can induce a LOT of IMD. Used in moderation, it is decent, and can twang up your music. Honestly, I’m not a big EQ guy, so I’ve largely let it alone except to ensure that it doesn’t muck up music too much. And it doesn’t. At least, not too much.
While Jr doesn’t have a huge amount of overhead for high-impedance, low-current headphones such as the DT880, it supplies ample volume and low distortion levels all the way to volume 75. Personally, I can’t stand the DT880/600 and Jr combination at volumes of over 62 for older recordings and 58 for newer recordings. Chase Emory probably will max Jr out.
Jr’s dry warmth fits the DT800’s contrasty signature very well. Mr. Speakers Alpha Dog headphones also sound good, but are equally as comfortable with the smoother AK380.
As for earphones, there is a break in performance when an earphone dips below the Jr’s 2Ω impedance output. Even then, it is minimal. But to be safe, you’ll want to use earphones with really flat impedance swings.
Honestly, I fell in love with the Jr through the Ultrasone IQ and the Grado GR10. Despite the two sharing little in common, the contrasty-VS-midrange IQ signature benefited from the Jr’s warm bass. And the GR10’s wide midrange benefited from Jr’s wall-of-sound sound stage. And I’m a Grado guy.
It is my personal opinion that Jr fits the signature of neutral to contrasty headphones very well. Warm headphones and earphones sound good through it, but compound Jr’s already warm personality.
VS the iBasso DX90
Before I get really into this, note that I don’t consider these players to be competitors. iBasso’s DX90 is an incredible machine. But it is a techie-oriented DAP: removable battery, hackable hardware/software, a nearsighted engineer’s design perspective, coaxial output, and a company behind it that is interested in price/performance ratios first, everything else second. In general, iBasso’s products perform pretty damn well.
Astell & Kern are a marketing company that make some good hardware and some bad hardware. Style is as important as anything else to their bottom line, to their product line, and to their customers.
I find as few cross points between A&K’s and iBasso’s customers as I find in their product line. And the beefy, style-be-damned DX90 is the gaming rig next to the AK Jr’s style-is-all Vaio or some other non-Apple design computer.
DX90 and Jr:
– hiss: similar levels of hiss
– storage: DX90 – 8GB; AK Jr – 64GB. No contest.
– battery life: a slight edge to the AK Jr but both are bad.
– sound signature: DX90 – cooler and more neutral; AK Jr – warmer and more musclier.
– output quality: DX90 – lower distortion, less load effect; AK Jr – higher dynamic range. Not a tie, and both are very good, but DX90 may be the more complete all-in-one device that doesn’t need an amp.
– outputs: DX90 has an amp-decoupled line output, and coaxial out. Jr makes do with a single, amp-coupled line output. DX90 FTW.
– in the hand: DX90 hurts less, but its horrible button placement, thickness, and small tough targets, make it a bugger to use. Jr could do with rounder edges.
– UI: even tied down by adolescent firmware, AK Jr is much nicer to use, funner, and classier.
I don’t like running comparisons in dedicated reviews, but since many readers (and Lieven) have begged me to add this section, I’ve done just that, but in Nathan style.
That said, if I Nathan had to spend his 500$ on a single player, it would be the AK Jr. While its GUI needs serious update, it is so much more polished. Sussing its interface is quick, and both its software and hardware buttons fall under the finger more ergonomically.
And while I dislike its sharp edges, its stylistic ethos is easier to suss. Both units are designed poorly for human interaction, but AK Jr is less bad.
Finally, while I appreciate enthusiast-level products, my money always goes to the artisan. Again, while I disagree with the AK Jr’s design ethos, at least Astell & Kern have got behind one.
For the enthusiast wanting the best output and functionality, DX90 it is, hands down. For the portable music listener that doesn’t want to fiddle as much, AK Jr is just that much closer to a full autonomous product.
But who am I to spend your money?
Jr lacks some of the functionality (optical output) of the AK100 and AK120 it has replaced. Its corners are stupidly sharp, its screen larger, but no more accurate. Its GUI is easier to navigate, but with a battery life that tops out at around 8 hours, it won’t carry the modern work day through.
Jr has a few serious design flaws. But, in my opinion, it is A&K’s best current portable DAP. It is slimmer, lighter, and less arbitrarily designed than either the AK240 or the AK380. And it’s less expensive and has a more straightforward UI than both the AK100ii and AK120ii.
The pudding on the pie is its rocking of Wolfson’s wonderful WM8740 DAC, plugging a niche that’s been empty since 2013.
Which means the following: I love the AK Jr. And I hate that it misses a few things.