Astell & Kern A&ultima SP3000T: One-minute review

The Astell & Kern A&ultima SP3000T is just the latest demonstration of the South Korean manufacturer's best-in-class philosophy in action. Astell & Kern makes no apologies where the pricing of its digital audio players is concerned and, more often than not, its products turn out to be well worth their considerable asking price. 

Fortunately, the Astell & Kern A&ultima SP3000T looks and feels like a premium product should and it’s specified to do the audio business in style, too. There are numerous technical highlights to its extremely thorough specification, but the real stand-out is Astell & Kern’s use of your actual, genuine vacuum tubes in the amplification stage. Thought valve amplification was just for massive, and massively expensive, old-school hi-fi separates? Think again.

On top of its technical credentials, the Astell & Kern A&ultima SP3000T is a lovely item in a fairly substantial way. It’s made from silver-plated stainless steel, for instance. Its controls are beautifully implemented. And its operating system is as stable and logical as they come. 

But the best thing about the Astell & Kern A&ultima SP3000T is the sound it makes. Truly, it is one of the best MP3 players around and then some. Listening to hi-res audio through decent headphones and it just sings – it expertly handles every technical aspect of music reproduction, but without losing sight of the fact that it’s supposed to be entertaining. So it’s a delight in pretty much every respect.  

Astell & Kern A&ultima SP3000T review: Price and release date

• Priced at $2,999 / £3,199 / AU$5,299

The Astell & Kern A&ultima SP3000T is on sale now, and in the United Kingdom it will set you back £3,199. In America it goes for a marginally more reasonable $2,999, while in Australia it will cost you AU$5,299. 

That’s a lot, isn’t it, for something that (on the face of it) doesn’t do anything your smartphone can’t do?

Astell & Kern A&ultima SP3000T review: Features

• Bluetooth 5.0; SBC, AAC, aptX HD and LDAC codec compatibility
• 32bit/768kHz and DSD512
• Vacuum tube amplifications

Well, it doesn’t take long to show that ‘it doesn’t do anything your smartphone can’t do’ nonsense for what it is, does it? Yes, this is a digital audio player and so is your smartphone – but by this rationale a rowing-boat is the same as a yacht.

Perhaps the obvious sign that this is a device specified without compromise to make your portable music experience as enjoyable as possible is the Astell & Kern's three-mode amplification. The A&ultima SP3000T uses a pair of Raytheon JAN6418 miniature vacuum tubes – actually military-valves – in its amplification stage. Each pair is carefully matched, and then equally carefully suspended in a full-on silicone PCB arrangement to guard against noise derived from vibration or minor shocks to the player's chassis. And then you can select ‘Tube Amp’ mode to enjoy what Astell & Kern calls ‘the natural warmth of a vacuum tube amplifier’. Of course, you could go with the more usual ‘OP Amp’ mode (for ‘expansive soundstage and crystal-clear resolution’) or a mix of the two with ‘Hybrid Amp’ mode (‘the richness of analogue blended with high-resolution clarity’). 

Obviously, you’ll investigate the sonic characteristics of each of these options, but it’s worth pointing out here that if you select ‘Tube’ or ‘Hybrid’ mode, the vacuum tubes themselves glow redly through a little window on the rear of the player. Which is disproportionately satisfying.

Elsewhere, Astell & Kern has been just as thorough. The audio circuit configuration, for example, calls for two AKM 4191EQ DACs to act as digital delta-sigma modulators to reduce noise from the input stage on the left and right channels independently before a couple of AKM AK4499EX DAC chipsets process the analogue signals. After all this complicated work has been done, the SP3000T offers a choice of six DAC filters to further finesse the eventual sound.

A Snapdragon 6125 octa-core processor with 8GB of DDR4 memory takes care of user interaction. It promises fast system operation and a stable, smooth user interface and the CPU, memory and wireless communication components are all grouped as a single system-on-chip for optimum efficiency as well as minimal heat and digital noise.

The SP3000T uses Bluetooth 5.0 for wireless connectivity and is compatible with SBC, AAC, aptX HD and LDAC codecs. Dual-band Wi-Fi means the player can be Roon Ready (and also means it’s simplicity itself to install your favourite music streaming service apps). It can support digital audio files of every type, and is compatible with file sizes of up to 32bit/768kHz and DSD512. By using Astell & Kern’s DAR (digital audio remaster) technology, sample rates can be increased in an effort to maximise sound quality – 44.1kHz content, for instance, can be upscaled to 352.8kHz and anything below 96kHz can be converted to DSD128.

The 5050mAh battery is good for around 10 hours of playback - although it’s worth bearing in mind that that figure applies to 16bit/44.1kHz content heard at moderate volume. The figure when listening to properly high-resolution stuff at bigger levels is considerably less. Charging the SP3000T from ‘flat’ to ‘full’ takes a leisurely 3.5 hours or thereabouts.

Internal memory is a useful-but-hardly-spectacular 256GB. Happily, there’s a microSD card slot on the bottom of the player that can accept cards of up to 1TB.

Features score: 5 / 5

Astell & Kern A&ultima SP3000T review: Sound quality

• Spacious and well-defined sound
• Detailed and dynamic in equal measure
• End-user options don’t impact performance all that radically

It almost goes without saying that the bigger the digital audio file you listen to the better, and the more accomplished the headphones you use the better, too. But unlike quite a few digital audio players at quite a few price-points, the Astell & Kern A&ultima SP3000T doesn’t hold you to ransom. It just makes the best of the situation in which it finds itself.

And what’s equally noteworthy is just how consistent the SP3000T sounds, no matter how you might try to influence it with your amplification and/or DAC filter choices. There are differences to be heard, of course, but they’re far from fundamental. At its heart, and in pretty much every circumstance, the Astell & Kern is an eloquent, entertaining and absolutely wide-open performer. 

A listen to a 24bit/96kHz file of Chick Corea’s Return to Forever using ‘Hybrid’ amplification and ‘short delay slow roll-off’ DAC filtering allows the SP3000T to really show what it’s made of. It’s a spacious, rigorously defined listen, with a huge amount of dynamic headroom available in order to track the numerous changes in volume and intensity the recording indulges in. It allows even the most complex recordings the space in which to operate and manages to tie every individual element of a recording together in order to present it as a whole.

The tonal balance – naturalistic and convincing, whether you’re listening to processed, electronic music or analogue recordings of analogue instruments – is beautifully judged, too. Low frequency information is deep and textured, straight-edged at the moment of attack and rhythmically positive as a result. The midrange is similarly detailed, which allows vocalists of all kinds the opportunity to describe their character and attitude as well as their technique. The top of the frequency range has shine and substance in more-or-less equal measure and, just as with every other area of the frequency range, is absolutely loaded with detail. It seems unlikely in the extreme that the Astell & Kern is overlooking any information in your favourite recordings, no matter how fleeting or minor – and it puts them into appropriate context with real positivity, too.

Some alternative players that get all this sort of technical stuff right can overlook the simple fact that music = entertainment, though, and indulge in the sort of analysis that makes them sound more like lab equipment. The SP3000T is having none of that. It’s an energetic, entertaining listen that prioritizes the enjoyment of music over the minutiae of how it’s been recorded. Which is why you’ll find yourself listening for longer than you expected, time after time.

Sound quality score: 5 / 5

Astell & Kern A&ultima SP3000T review: Design

• Silver-plated stainless steel
• 142 x 85 x 18mm (HxWxD)
• 483g

As is standard Astell & Kern operating practice, the A&ultima SP3000T is pointily angular, and is the sort of weight (483g) and size (142 x 85 x 18mm, HxWxD) that manages to feel expensive without ruining its portability. As long as you’ve a nice strong pocket to put it in, anyway.

The frame of the player is made from 316L stainless steel, plated with 99.9 per cent pure silver, which looks and feels about as luxe as you might imagine. The bottom edge features a USB-C socket alongside that microSD card slot, and the left side has four little playback control buttons. The right side, meanwhile, features the company’s trademark knurled volume control in a deep, interestingly shaped recess. There’s a light behind the control – its colour depends on the type and size of the digital audio file that’s playing. 

On the player’s top edge there’s a power on/off button and all the outputs. There are 2.5mm and 4.4mm balanced headphone sockets and a 3.5mm unbalanced alternative which also doubles as a digital optical output.

The front of the machine is almost entirely touchscreen. It’s a big (5.5in) number of 1080 x 1920 resolution, it’s bright and crisp, and it’s responsive, too. Navigating menus, investigation playback options, loading apps and what-have-you can all be done easily and quickly.

It's also worth nothing that – for reasons best left to Astell & Kern itself – the case is made from calfskin. Vegans, and anyone opposed to using animal products in general, should look away now.

Design score: 5 / 5 

Astell & Kern A&ultima SP3000T review: Value

Obviously this is a madly expensive device by prevailing standards ($2,999 / £3,199 / AU$5,299). And obviously it’s not easy to make a product that is, by necessity, small enough to be realistically portable. But the SP3000T is beautifully made, from premium materials, is specified like there’s no tomorrow and is able to deal with each and every file type and size you might consider listening to. 

And, most significantly of all, it’s an uncomplicatedly delightful listen. Does it represent ‘value’? To those who want the best around and are able to pay for it, the answer has to be ‘yes’.  

Should I buy the Astell & Kern A&ultima SP3000T?

Buy it if... 

Don't buy it if... 

Astell & Kern A&ultima SP3000T review: Also consider

How I tested the Astell & Kern A&ultima SP3000T

• Tested for over a week
• Tested with streamed and downloaded content
• Tested with wired and wireless headphones

I installed my Qobuz and TIDAL accounts and I loaded the player with a lot of high-resolution content, too, from 24bit/96kHz stuff up to DSD128. I used expensive over-ear and in-ear headphones via the 4.4mm and 2.5mm outputs, as well as considerably less expensive true wireless earbuds connected via Bluetooth. 

I investigated amplification, DAC filter and EQ options. And then I listened to a variety of music, for several hours a day for well over a week. And then, rather tragically, I had to return the SP3000T to its owners… 

• First reviewed in June 2024

• Read TechRadar's reviews guarantee