DAC / AmpOverreview

iFi iDSD Diablo 2

A genuinely powerful portable with a power rating it couldn't live up to — and a bright streak that splits the room.

31 sourcesUpdated
$1,299Typical US price

Score aggregates reviewer opinions across topics.

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iFi iDSD Diablo 2

The short version

What to know.

A battery-powered transportable DAC/headphone amp with balanced 4.4 mm and 6.35 mm outputs, USB-C, S/PDIF, a 4.4 mm line in/out, Bluetooth 5.4 with aptX Lossless, iEMatch and an xMEMS mode, sold at $1,299 since late 2023. Sources broadly agree it is quiet with sensitive in-ears, well stocked with inputs and accessories, and solidly built, if too large to pocket. They split on power — enough for nearly any headphone in practice, but measured at roughly a third of the 5,180 mW that iFi first advertised and current-limited into low-impedance planars from the balanced jack — on its voicing, which some hear as clean with a hint of warmth and others as bright and forward, on a gain structure that makes in-ears hard to set without iEMatch, and on whether it is worth $1,299 when it measures and sounds much like the cheaper original Diablo.

About this product

The 2023 iDSD Diablo 2 in its standard red. Not the 2021 iDSD Diablo or the xMEMS-ready Diablo-X it replaced, and not the 20-piece gold 'Auric' limited edition.

iFi's iDSD Diablo 2 is the company's flagship transportable DAC/headphone amp: a ribbed red aluminium slab with a Burr-Brown DAC, a balanced 'PureWave' amplifier behind 4.4 mm and 6.35 mm jacks, three power modes named Normal, Turbo and Nitro, iEMatch for sensitive in-ears, an xMEMS mode for the new solid-state earphone drivers, and Bluetooth 5.4 with aptX Lossless. It launched in November 2023 at $1,299, some $400 above the original Diablo it replaced, and ships with a mains supply, a carry case and slide-in 'wings' that turn it into a desktop unit.

It arrived billed as a 5-watt portable, and within two weeks a bench showed that figure was a single-cycle peak; iFi apologised and added RMS ratings to its page. What remains is an argument about how much that matters for an amp that still drives almost anything — and a quieter one about its bright, forward voicing and a price well above the iFi boxes it resembles.

A good fit for

  • One box for home and travel that has to drive demanding full-size headphones from battery
  • Owners of warm or dark headphones (HD 600-class, Audeze LCD-2) who want extra energy and detail
  • Listeners with an aptX Lossless phone who want lossless Bluetooth from a portable amp

Think twice if

  • You mostly listen with sensitive in-ears and don't want to rely on iEMatch
  • Your headphones are already bright or you are treble-sensitive
  • You run very low-impedance planars and want the balanced jack's full power
  • You already own the original Diablo, or would be happy with iFi's cheaper Gryphon or iDSD Signature

The reviewer consensus

Agreement &
disagreement.

4 / 7topics divide opinion
noisefeaturesbuildpowertransparencyergonomicsvalue
3 Mostly agree4 Divided opinions

Common ground4

  • Quiet with sensitive in-ears — a measured 9.4 µV residual, and most owners hear a black background
  • An unusually complete feature set: USB-C, S/PDIF, analogue in/out, Bluetooth 5.4 with aptX Lossless, iEMatch and xMEMS
  • Solid, well-finished aluminium build with a generous accessory bundle

Points of contention4

  • Power: enough to drive almost anything in practice, versus a real output about a third of the advertised maximum that runs out into low-impedance planars on the balanced jack
  • Voicing: clean with a hint of warmth, versus bright and forward enough to fatigue with bright headphones
  • Ergonomics: well-judged knob and volume lock, versus a gain structure too hot for in-ears and switches that move too easily

A closer listen.

7 topics · 4 divided
Left: criticalRight: positiveTighter lines: more agreement

Power

Leans positiveDivided opinions
Reviewer sentiment25 supporting sources
CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Sources split. About two-thirds of the weight — led by Hi-Fi News' bench, which measured 2.49 W into 32 Ω from the single-ended jack — finds it drives HD 650s, Arya, Ether CX, HE-6se V2, Expanse and even Susvara-class loads with headroom, and several say that sort of power is more than any portable needs. The other third centres on the gap between iFi's launch claim of 5,180 mW and the roughly 1.6 W the balanced output sustains: GoldenSound's bench, the ASR thread and Amazon's low-star reviews call the rating misleading, and owners of 14 Ω LCD-5 and similar loads report the balanced output tripping its current protection where the single-ended jack does not. The split is less about whether it is powerful than about what was promised and which jack you use.

Measured

GoldenSound (APx555): about 1.6 W RMS balanced into 32 Ω before clipping, about 2.5 W on a CEA-2006 20-cycle burst, and up to 2.3 W RMS from the single-ended output in high gain; into 32 Ω in high gain the unit shuts off past roughly 1 o'clock on the knob. iFi told GoldenSound the 5 W figure came from a single 1 kHz cycle. Hi-Fi News (6.35 mm output): 150 mW into 600 Ω, 2,490 mW into 32 Ω and 2.2 W into 8 Ω, with 0.3 Ω output impedance. iFi's page now lists RMS power of 1,710 mW (32 Ω), 2,060 mW (64 Ω) and 611 mW (600 Ω) balanced, and 2,050 mW (32 Ω) single-ended, beside the 5,180 mW 'maximum'.

vs. listeners — The benches don't contradict the 'drives everything' camp so much as explain it: the single-ended jack delivers more current into low impedances than the balanced one, which the original iDSD designer describes on Head-Fi as the balanced output being current-starved below roughly 150 Ω. Every shutdown or tripped-protection report involves a low-impedance load in the highest mode, and the owner who hit it with a 14 Ω LCD-5 on the 4.4 mm jack had no trouble from the 6.35 mm jack; into 600 Ω Hi-Fi News measured the single-ended jack at its rated 150 mW. iFi's December 2023 statement blamed 'human error' for listing only the maximum figure — the criticism is of the rating, which has since been corrected.

Where it splits
Enough for almost anything — even if not the 5 W on the box67%

“The iDSD Diablo 2 is certainly the most capable compact headphone amplifier so far tested in Hi-Fi News.”

Paul Miller · Hi-Fi News lab
Far below the advertised figure, and current-limited into low-impedance loads33%

“The iDSD Diablo does NOT have 5W of power as iFi states on the product page and marketing material! It has 1.6W!”

GoldenSound · measurements (APx555)
Link to this topic

The hardware

Specifications.

Checked

Design

Form factor
Portable
DAC
Burr Brown
PCM
768 kHz
DSD
DSD512
MQA
Yes
Amplifier
PureWave full balanced dual-mono

Output

Output power
Single-ended: 2,050 mW @ 32 Ω · 1,360 mW @ 64 Ω · 150 mW @ 600 ΩBalanced: 1,710 mW @ 32 Ω · 2,060 mW @ 64 Ω · 611 mW @ 600 Ω
Output impedance
< 1 Ω SE · < 1 Ω bal.
Volume
Analog pot
Signal-to-noise
≥ 114 dB

Connection

Digital inputs
USB-C, Optical, Coaxial, Bluetooth
Analog inputs
4.4 mm
Headphone outputs
4.4 mm, 6.35 mm
Line outputs
4.4 mm
Preamp output
No
Bluetooth
Bluetooth 5.4aptX Lossless, aptX Adaptive, aptX, LDAC, LHDC, AAC, SBC
Power
Battery
Battery
12 h

Physical

Weight
455 g
Dimensions
166 × 85 × 28.5 mm
Released
2023-11

Power figures are iFi's RMS ratings; its separate 'maximum' rating is 5,180 mW into 32 Ω balanced. Manufacturer-published figures, not measurements · from ifi-audio.com, cdn.shopify.com, ifi-audio.com.

Follow the evidence

Sources 31

1–6 of 31 sources

Read with context

Limitations & method.

As of

What to keep in mind 6

  1. A read of where the reviews land as of September 2026, nearly three years after launch; the price has held at $1,299 but newer portables keep moving the field.

  2. iFi's page now lists both a 'maximum' and an 'RMS' power figure; many early reviews quote only the 5 W maximum, so compare like with like when reading them.

Where to buy Product & retailer links

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