The Devil in the Detail
Pure Sonic Performance
The iDSD Diablo, with its sleek new design and fiery red finish, sits proudly at the top of our range of portable/transportable DAC/amps. It is built for purists – the true headphone enthusiasts who crave pure, unadulterated sonic performance.
Just like a racing car designed for uncompromising speed, the iDSD Diablo sets aside sonic tailoring as well as Bluetooth connectivity to focus on pure sonic power. Prepare for a riveting ride as it will drive any headphone on the planet with aplomb.
Put simply, the iDSD Diablo is our best ever transportable amplifier designed to deliver reference level sound.
We use two Burr-Brown DAC chips and the new 16-core XMOS chip to process the data received via the USB and S/PDIF digital inputs.
This means the iDSD Diablo can handle up to PCM 768, DSD 512, 2xDXD. Both PCM and DSD remain ‘bit-perfect’.
It also provides full MQA decoding!
Balanced, differential analogue circuit design reduces noise and cross-talk within the signal path by fully separating the left and right channels. The iDSD Diablo benefits from further refinements to our balanced, symmetrical dual-mono topologies with short, direct signal paths. We call this PureWave.
Negative feedback is used in amplifier circuits to compare the output signal with the input signal and correct errors. BUT there are drawbacks. iFi turns the negatives into positives with OptimaLoop.
Able to drive all manner of headphones with ease, the iDSD Diablo delivers up to 5000mW of prodigious power, propulsive energy and engaging dynamics, coupled with a remarkable ability to resolve fine texture and detail.
With 3 settings, you can adjust power and gain to suit your daily driver or track day supercar!
- Turbo – ramps up the level of drive for current-hungry headphones
- Normal – for most over or on ear headphones
- Eco – dials down the power to suit high-sensitivity in-ear monitors
Power that does not corrupt.
The iDSD Diablo’s focus on pure, unadulterated performance, means much attention has been applied to the power supply circuity.
Battery power provides ultra-clean and stable DC current avoiding the issues of mains electricity – dips, spikes and noise-inducing RFI/EMI pollution. BUT there are sonic downsides resulting from low output voltage and inconsistent output impedance as batteries discharge.
These issues are fully tackled by the iDSD Diablo’s design.
In order to make less eﬃcient headphones, like planar magnetics, sing, the voltage needs to be stepped up from 3.7V to +/- 15V. We use a step-up converter running at 1.2MHz – a frequency far beyond audibility that is easier to filter than a typical switch-mode supply, enabling high linearity and ultra-low noise.
Formula 1, iFi style.
High-bandwidth power supply circuity is dedicated to each critical part of the iDSD Diablo’s design, with independent linear regulation delivering excellent PSRR (Power Supply Rejection Ratio) performance.
The headphone amp stage eschews IC regulators in favour of Panasonic OS-CON capacitors, delivering 2320uF between them.
The DAC section benefits from an ultra-low-noise regulator with additional passive filtering, reducing high order harmonic distortion and, in turn, jitter.
Even the USB input stage benefits from dedicated regulation and multi-stage filtering, and the microprocessor control circuitry (often a local source of digital noise) has separate regulation, too.
Crucial components for maxed out performance, more below.
Hooking up with the Devil…
At the front of the unit, alongside a standard 6.3mm single-ended headphone socket, resides a 4.4mm Pentaconn output for headphones offering balanced connection.
At the back are two digital audio inputs: USB-A and a S/PDIF socket that accepts both electrical and optical signals, the former via a 3.5mm connector and the latter via a supplied adapter.
The USB-A input features a ‘male’ connector, rather than a typical ‘female’ port for greater mechanical integrity. A separate USB-C charging port is also provided, along with a 4.4mm Pentaconn balanced output to connect to an external amp.
As befits a reference-level product, we’ve included a whole host of accessories in a luxurious travel case, the iTraveller.
As the iDSD Diablo may be powered from the mains, as well as by its built-in battery, we’ve included our super silent, noise-cancelling iPower 5V AC/DC adapter to ensure optimal sound quality.
Also included is a 4.4mm Pentaconn to XLR balanced interconnect cable to connect the iDSD Diablo to an amp and speakers (or a pair of active speakers) with balanced XLR inputs.
Other supplied connectors include a high-quality USB-A audio cable, a USB-A to USB-C charging cable and an adapter to connect headphones with a 3.5mm jack to the 6.3mm single-ended output.
- The Burr-Brown True Native® chipset means file formats remain unchanged or ‘bit-perfect’. This means you are listening to music as the artist intended in the format in which it was recorded.
At iFi we use Burr Brown extensively in our products having selected it for its natural-sounding ‘musicality’ and True Native architecture. Our experience with this IC means we know how to make the most of it.
- The XMOS 16-Core chip processes the audio data received via the USB* digital input.
This new low-latency XMOS microcontroller has greatly enhanced processing power. Compared to the current generation of eight-core chips, this new 16-core IC delivers double the clock speed (2000MIPS) and four times the memory (512KB), as well as the latest SuperSpeed USB standard.
iFi’s in-house digital development team has programmed the XMOS firmware to optimise sound quality and ensure a perfect partnership with the Burr-Brown DAC.
(* Also on S/PDIF on the NEO iDSD/Diablo)
- MQA is an award-winning audio technology that enables music fans to stream the original master recording into their home, car or on their mobile. In the words of Gilbert O’Sullivan, iconic Irish-born singer-songwriter, “The great thing about MQA is that it delivers the finesse that was there in the desk sound. It’s tremendous, it sounds really good.”
MQA (Master Quality Authenticated) is supported through the USB with full decoding of MQA files up to 384kHz thanks to the processing power of the new 16-core XMOS chip.
This means that the full ‘three unfold’ decoding process is performed internally, as opposed to only the final unfold in the manner of an MQA ‘renderer’.
Globally, MQA has become an important consideration for any comprehensively equipped DAC. It is available through for Tidal Masters, Audirvana and Roon.
- Balanced, differential analogue circuit design has long been championed for its ability to reduce noise and cross-talk within the signal path by fully separating the left and right channels.
PureWave is a new, balanced, symmetrical dual-mono topology with short, direct signal paths. The name refers to the sonic purity it achieves thanks to exceptional linearity and infinitesimally low levels of noise and distortion.
- ‘Negative feedback’ is used in amplifier circuits to compare the output signal with the input signal and correct errors, in order to control gain and reduce distortion.
For sound quality, this is positive; BUT commonly applied, one-size-fits-all ‘global negative feedback’ can also highlight different problems at the same time as solving others – corruption of the error signal, phase shifts, group delay and so on can all have a negative impact on sound quality.
We recognised that different parts of a circuit benefit from specifically optimised feedback loops and have developed a negative feedback system that is much more accurate than the usual approach. This incorporates multiple feedback paths instead of a global loop, each path optimised for a particular function and working synergistically with the others to deliver optimal overall performance.
- Extensive jitter-eradication technologies are applied to the digital stage, including our GMT (Global Master Timing) femto-precision clock and intelligent memory buffer. This represents a total ‘out-of-the-box’ systematic digital solution that solves jitter once and for all.
- An important aspect of the circuit design is its direct-coupled nature (no coupling capacitor is present), achieved without a conventionally applied DC servo.
DirectDrive® equals a direct signal path which means less signal degradation. This direct signal path is unequalled in audio and is the reason why the sound is so ‘true’.
- As with many other iFi audio products, we’ve incorporated a custom OV Series operational-amplifier. This top-notch component contributes to the extremely low noise, low distortion (0.0001%) and wide bandwidth.
- Switching between settings has been engineered to ensure sonic transparency with advanced trench technology MOSFET is used as a muting switch.
This FET-based switching is handled by a micro-controller, which only ‘wakes up’ when the user changes a setting, thus eradicating any sonically deleterious interference.
- TDK C0G (Class 1 ceramic) capacitors offer high stability and low losses for resonant circuit applications.
Getting ever closer to the theoretical ideal of pure, frequency-constant capacitance, these capacitors reduce capacitor-induced distortion to vanishingly low levels.
They are pricey but are a perfect addition to our products.
- Panasonic OS-CON caps totaling 5,410uF give very-low Equivalent Series Resistance (ESR), excellent noise reduction capability and frequency response characteristics. In addition, OS-CONs have a long-life span and its ESR changes little even at low temperatures since the electrolyte is solid.
They are not often found in products costing <US$1000.
- Vishay MELF resistors – complex, costly but superior.
These metal electrode leadless face resistors have excellent accuracy, stability, reliability, and pulse load capability. They provide optimal power rating and pulse load capability. They show some of the lowest noise and distortion of any resistor available in the market, period.
- muRata control-type, low-ESR high-Q multi-layer capacitors. The ‘ESR control’ aspect of the Murata is something special. Their noise suppression abilities are impressive.
- Texas Instruments low-noise ICs offer great unity-gain bandwidth, very low noise and distortion, high output drive capability, Common-mode and Power Supply Rejection Ratios of over 100 dB, wide maximum-output-swing bandwidths and high slew rates.
|Digital Inputs||USB 3.0 type 'A' (USB2.0 compatible)
S-PDIF (3.5mm coaxial/optical)
|THD + N||Balanced
|Headphone Max Output||Balanced
|>19.2V/611 mW (@ 600 Ohnn)
>12.6V/4,980 mW (@ 32 Ohm)
>9.6V/153 mW (@ 600 Ohm)
>8.8V/2,417 mW (@ 32 Ohm)
|Fixed Audio Output||Balanced 4.4mm|
|Power System||Charging via USB-C (iFi iPower included)
BC V1.2 compliant up to 1900mA charging current
|Dimensions||166 x 72 x 25 mm
6.5" x 2.8"x 1.0"
|Weight||330g (0.73 lbs)|
|Warranty period||12 months|
|*Specifications are subject to change without notice.|
iFi - micro iDSD Diablo DAC/amp
This is a nice unit but with a caveat. It has substantially more power than the Idsd signature however it uses the same battery. What this means is that when you drive power hungry phones at a loud volume it drains the battery fast. One reviewer noted that it drives their Hifiman HE6-Se fine, well I own them too however I never bothered to test them because when using the Hifiman/Drop Edition XX, which require less power, at the level I like to listen at, it drains the battery in as little as a half an hour, or less in turbo mode. These phones can take nearly full power in turbo mode. This unit is a must for me however because I like to listen very loud. This pairs best with my Audeze LCD-XC which I use on normal mode. Now I don't mind the short battery life because I use an external battery pack strapped to the unit. If you charge the Diablo first, which you should, it will basically run off the battery pack. My battery pack is about the same size as the Diablo which I originally used with the Idsd Signature because it too had a shorter battery life driving the Edition XX,more than a half hour though, and it lasts forever. All in all the Diablo is much better than the Idsd Signature IMHO. It plays louder without breaking up and it is way more detailed. I don't mind using the external battery and don't care about the extra weight so for me the Diablo is a win. I do think they should have used a bigger battery though. To sum things up, this is a great unit but if you have very power hungry phones and you like to listen very loud then the battery life will be unacceptable without using an external battery.
It drives my power hungry HE6Se just fine. Has nice dynamics and soundstage. I also tried with Hd800 and ZMF Aikon both drive at ease with diablo. I am happy with my purchase.
Awesome amp/dac, I only owned the xdsd before this diablo. Huge upgrade for me personally. New to higher end audio. For me, this diablo is perfect. It sounds really clean and powerful. I mainly use it with my Focal elegia and dt 990 80 ohms sometimes. It sounds great with my elegia on eco mode, hopefully soon I can buy the focal clears. Overall I love the diablo, I use the ipurifier and I bought the mercury 3.0 cable and I'm really loving the sound. Would love to try it with a balanced 4.4mm cable at some point. I think it does sound really pure maybe ever so slightly bright but in a very good way. Overall I think it's a great "audiophile" amp/dac-at least to my rookie high end audio ears
I’ve spent 5 days with the Diablo and it’s been a very good time streaming Tidal masters (there’s a good family plan going on) and very quickly via Roon. My previous experiences with iFi has been the Nano BL, Micro BL and Zen Can. The build is more ergonomic in my hands and feels just as well built as the Micro BL (which presumably has a very close build to the new Signature). Love the red color but I can understand the appeal of the beautiful matte blue. It’s just as big as ever so it makes a great transportable set up. The sound is transparent, detailed and has good overall bass/mids/treble. “Neutral” especially when compared to the classic iFi house sound found in the Micro BL and I hear in my Zen can. Using my Audeze LCD2 closed and ZMF Verite open. They have punch and clarity that the Micro BL and especially Nano didn’t have. Yes, the Micro BL is quite dynamic so it’s not a flat sounding device but has more of a colored warmth low midsy ****. Using my iFi Zen Can I can tell it has a warmer/midsy sound to it compared to the more linear sound of the Diablo’s amp/DAC. The bass is slightly emphasized but doesn’t overstate its presence even with bassier headphones like my CA Cascade. Using turbo mode the LCD2 closed back is driven with authority that otherwise has a loose and weakish sounding bass and shouty upper mids/treble when not fed enough current. It also powers the Sundaras in a similar fashion with that full body sound. I’ve heard the Sundaras called thin/bright but no so much when fed right IME. Turbo mode is super dynamic and is perhaps my favorite when the cans call for it. The Cascades goes into overkill with anything above Eco mode. The Sundara and Audeze sound full with normal mode at 12 but more dynamic on turbo below 12 The Sennheiser and Verite both take normal mode on well but dynamics improve with Turbo. The mids seem to be there with no real forward bite but no recessed sound that is perhaps the result of amp distortion that’s part of the iFi house sound again in my experience with Micro BL and Zen can. Audeze closed back can become quite shouty in the mids but sounds smooth here. Treble seems pretty forward or at least not as tamed as the Micro BL. The Verite open benefits from a brighter output that I found to be lackluster when paired with Micro BL and Zen Can. I can easily listen to my Verite on the Diablo without missing too too much of my Tube/DAC streamer desktop set up I have (and love). Overall, I’m quite happy with the sound and function of this model. Sure it’s missing the classic iFi buttons but trades that off for a cleaner, even more dynamic and powerful-desktop like performance. Just my quick impressions as I’ve still to spend more time with it on Roon. Things like texture and separation are also harder to describe and detect especially with New Toy Syndrome.