If you’re like me and primarily use a laptop computer, you’ll know the trials of extracting great sound from your computer. In my case, the onboard sound is actually quite good, but it’s not exceptional and I like exceptional.
At home, the sound processing is handled by my Audio-gd NFB-5.2. On the road I used to use the Creative X-Fi HD USB, but as good as the X-Fi is, I had a couple of needs that it couldn’t quite meet. Firstly, it required a separate lead to connect so I ended up with boxes and cables everywhere. Secondly, it struggled to effectively drive my low-impedance IEMs like the Shure SE535 LEs and now my Unique Melody Miracles (review coming soon).
After much hunting, I finally found a DAC that I thought would meet all my needs. Does it? Read on to find out…
The DragonFly is a DAC and headphone amp created in the form factor of a full-size USB thumb drive. That means it is about 3-4cm long, around 1cm thick, and about 1.5cm wide. At that size I wouldn’t have expected particularly strong performance, but other reviews I read suggested otherwise.
The DF’s general specs are very competitive:
- Sample rates: 44.1kHz – 96kHz
- Minimum HP impedance: 12 ohms
- Maximum power: 150mW
I was excited to see the 12 ohm minimum rating for the headphone impedance as it suggested that my 15.9 ohm UM Miracles would pair well with the Dragonfly. We’ll get to that shortly…
The design of the DragonFly is simply brilliant. It’s tiny, requires no USB cables, feels solid and high quality, and works flawlessly in general terms. I was particularly pleased to note that it’s small enough to not obscure adjacent USB ports.The chassis of the dragonfly is coated in a nice soft-touch black paint and overall it feels very high quality.
A fun (and useful) feature of the DragonFly is its LED indicator light. The indicator lights up in different colours depending on the status of the sound feed and the sample rate being used. It’s red when there is no activity and then turns to green (44.1kHz), blue (48kHz), Yellow (88.2kHz), or magenta (96kHz). It’s kind of fun to see the light change between different tracks at different sample rates and it’s useful to see if your settings are correct (i.e. if you play a high sample rate track and the light stays green, you know you’re settings are causing the system to down-sample your music).
If I had to find one fault with the design of the DragonFly it’d be the separate cap. So far I’ve kept hold of it, but I can see it being lost far too easily and wonder if it would have been possible to have it somehow stay attached to the body of the DragonFly (e.g. with a short string so it hangs free when not in use, but doesn’t get lost). It’s a tiny gripe, but it would prevent having to be quite so careful to place the cap in the bag every time I uncork the DAC.
The DragonFly works without any special drivers which is a nice plus in my eyes. I’ve tried it with ASIO4ALL and with WASAPI and it works perfectly with both. I’ve settled on WASAPI because it’s easier in my setup, but there is no significant difference I could find between the 2. Regardless of the output drivers, the DF also handles all supported sample rates equally well with no hiccups.
Another nice piece of functionality with the DF is that it’s happy driving moderate impedance IEMs like the Re272s and V-Sonic GR07s as well as high impedance cans like the HD650s, but it can also be paired with a separate amp using the DF’s 3.5mm jack as a line-out. To do this, Audioquest recommend turning the computer / DF volume to full, but I’ve found it can be used perfectly well as a variable line-out.
When pairing with amplifiers like the Tralucent T1, which has very high gain, the variable output of the DF is a godsend. You can reign in the volume on the DF so you can use a better range of attenuation on the amplifier’s volume pot.
In terms of functionality, there’s really nothing lacking in the DragonFly – it does what it does flawlessly in terms of straight-forward functionality.
Where the rubber meets the road… a DAC and amp is only ever as good as it sounds and the DragonFly sounds very good, but perhaps not as exceptional as I’d hoped. I think my expectations were a touch unfair though so read on and I’ll explain in full.
In terms of basic sound quality, the DragonFly is excellent. It creates plenty of space in the soundstage, good placement of the sound image and nice response across all frequencies without any hint of colouration.
I’ve tested it with a number of devices including:
- IEMs ranging from 15.9 ohms to 50 ohms
- Headphones ranging from 32 ohms to 300 ohms
- Active speakers
- Portable amplifier
In all but one case, the DragonFly sounded great. Perhaps not quite as good as the Audio-gd NFB-5.2, but that’s to be expected when comparing a USB powered device to a mains powered device.
The DragonFly works extremely well as a simple DAC with line-out. The sound provided to active speakers or a separate amplifier is clean, spacious and sweet. Being able to use the computer’s volume control as a variable line-out is a definite bonus too.
The output power of the DragonFly is simply amazing! The Creative X-Fi HD USB was just able to drive the 75 ohm Utrasone HFI-680s to a good listening level, but was underwhelming with the Sennheiser HD650s. The DragonFly manages to drive the HD650s to full listening volumes while still having plenty of room to spare in the volume adjustment range.
Of course, it doesn’t have quite the dynamics of a mains powered desktop amp, but you can’t expect that from USB power. As it stands, it’s the best USB powered device I’ve heard when driving power-hungry headphones.
If you thought there was a “but” coming, you’re unfortunately right. The DragonFly maintains sweet sound on the 20 ohm Re272s and 50 ohm GR07s, but sounds a bit harsh with the 15.9 ohm Unique Melody Miracles.
I expected better performance at low impedance due to the 12 ohm minimum rating published on the DragonFly’s box, but while it probably can handle 12 ohms, it won’t be with optimum sound quality.
I found a massive jump in sound quality by feeding the DragonFly’s line-out into the Tralucent T1 amp* before passing it onto the Miracles. You’d expect some improvement with a dedicated amplifier, but this jump was too great to be the amp’s prowess alone. To my ears, the DragonFly just doesn’t pair well with loads below about 20 ohms. That’s a shame to be sure, but given the distinct lack of a USB DAC/amp with 16 ohm prowess (from what I’ve seen and heard so far), I have resigned myself to using the DragonFly with the T1 if I want to listen to the Miracles from my laptop. For everything else, a direct connection to the DragonFly provides outstanding quality sound for a USB device.
* Obviously, the power of an amplifier isn’t required for low impedance IEMs like the Miracles, but a good amplifier will offer better control over the transducers in a low impedance IEM setup and will therefore provide better, smoother sound.
Interestingly, measurements conducted by Stereophile.com show the DragonFly has very low output impedance (around 0.65 ohms) which would normally indicate a good match with devices in the 16 ohm range so I am not entirely sure why the DragonFly doesn’t excel with the Miracles.
All-in-all the DragonFly is a brilliant piece of kit. For it’s size it is unbelievably powerful and sounds fantastic. It offers all of the processing features of more expensive desktop DACs (except support for 192kHz sample rates which few if any USB devices offer) at a relatively low price and with incredible portability.
At around $200-250 depending on your location, the DragonFly is fantastic value and its portability and compact design make it a winner in my book. It won’t outperform top-end DACs or separate, dedicated amps, but it’s the combination of size, functionality and very good performance that makes this a worthwhile purchase.
Perhaps don’t buy it to directly drive low impedance IEMs, but do buy it to connect to higher impedance ear / headphones, active speakers, and amplifiers.