Last week I received the Audioquest Dragonfly version 1.2.
It's out in the market since around November 2013. Gordon Rankin from Wavelength Audio sits behind the design of the interface. The version 1.0 lost quickly ground against the thumbDAC competition. Gordon put some more brain into the tiny device to make it sing. Beside that Audioquest
stepped on the price break. They must have realized that high volume sales is a key success factor in that market.
I thought I give it a try. Most reviews I read were quite positive. Especially those comments saying that the 1.0 weaknesses were more or less successfully addressed with 1.2.
The new pricetag seemed to be in a nice range. The old 1.0 DF sells around 99$ nowadays btw.
Below you'll find my point of view and some Linux related hints in the annex of that article. (Note: There is no Linux documentation for the Dragonfly)
I'm currently testing this or that "thumbDAC". My goal is to slim down my stereo as much as possible without taking compromises in terms of handling and soundquality. I do think it's possible in 2014.
There's IMO no need in invest in vastly overpriced audiophile gear anymore.
My current reference, in terms of value for the money, is a 99€ battery driven DIY DAC with PCM5102 DAC and XMOS receiver from JLsounds.com. (You'll find a lenghty thread over at DIY-Audio.) It also delivers up to 384khz SR and DSD. If you add the additional batteries etc. you'll end up in the same range as the naked Dragonfly.
The JLsounds interface does come with highest quality SPDIF (IMO better then Audiophilleo) and I2S outputs.
I tested a M2Tech USB DAC against the JLsounds IF earlier. The M2tech DAC was a real nice performer. What made me send the device back, was its price and the lack of features (SPDIF/I2S).
At 200€+ the M2Tech is IMO too expensive in comparision to its 2014 competition.
Even worse from a pricepoint are e.g. Meridian Explorer.
Now back to the Dragonfly 1.2 .
The Dragonfly 1.2 comes at a rather reasonable rate of 150$/€ nowadays.
The killer feature is its analog volume control. Which clearly differentiates that interface from others.
Obviously the device is facing fierce competition, when it comes to the thumbDAC market standards
in terms of features. It delivers up to 96khz and no DSD @ 24bit only. That's far below most other devices. But. Who needs more than the Dragonfly delivers??
I received a Dragonfly for testing (let see if I'll keep it).
Even though Audioquest outlines Windows and iOS support only, the Dragonfly also works under Linux. I did not run any tests on Android.
The DF allows 24bit only. Most current devices allow 32bit. 32bit might have slight advantages over 24 bit in terms of SW volume control, DSP outputs and bit depth conversions on the transport side.
The tricky part, from a handling perspective, is the DF internal "analog" volume control. You need to use the OS mixer to address the volume control on the interface.
If your application uses an internal SW volume control, you won't take any "benefit" of that external analog volume control. You basically need to handle two volume controls at a time. Better check twice, what volume control you are using!
With Linux "alsamixer" you can set the Dragonfly internal volume control. Make sure the alsamixer is set at all. Otherwise you might have "No Sound".
Alsamixer shows a range from 0 - 100% and translates that into
db gain: 0.00-0.19
Hmmh??? Not sure but something is wrong with the mapping I'd guess.
Beside that only 10 steps are offered.
I'd guess the USB driver needs an update/quirk. I hope that the 100% is 100% at least.
The Dragonfly is therefore not 100% compatible with Android or Linux.
But. It is working.
You can use the DF analog control nicely to set a fixed "gain" for your chain properly.
Most of the amplifiers out there run a gain of 24-30db. Which is usually far too much considering the 2V+ supplied by most of the DACs and 89db/W+ speakers out there.
Without that analog volume control, you'd be forced to run a pretty high SW attenuation. We don't want that. Therefore I do consider this analog volume control a real nice feature.
My current transport is a CubiTruck, running a tailormade ArchLinux and Squeezelite btw. The Dragonfly feeds straight into a double mono Hypex UCD180 amp for the time being.
I'm currently running the Dragonfly buspowered. External power might lift it's performance further up. I'll try that later.
My current impression - after 3 days - soundwise:
The DF sounds really nice. It sounds pleasant, warm and natural without losing too much on e.g. percussive details. On percussion I experienced more micro dynamics with other DACs. The space between and around instruments is not that huge. Still instruments are nicely separated and not mixed or overlayed.
On complex orchestral recordings I can hear some "flutter" distortions. Here an USB-isolator or a better power source might do the trick.
Still. Overall it's quite a nice lean-back experience.
And it might even change to the better, if I use a better supply or USB filter.
Perhaps the DF needs some more days to fully break-in.
To be honest I'm asking myself already now, if it's really worth to go the DIY route any longer.
The Dragonfly (add the M2tech USB DAC to the list) is more or less Plug'n and Play and performs quite well. Hook it up to the Raspberry Pi and you'll have the perfect replacement for a Squeezebox Touch at 200$/€. Soundwise it'll for sure be a nice step up to a Squeezebox Touch.
Note: Have a look at my iFi Nano iDSD review. The Nano IMO outperformed the Dragonfly.
ANNEX: Linux Hints
There is no documentation about the Audioquest Dragonfly and Linux.
I wrote up some points you might find interesting.
1. Find out card number
or store exact result in variable
cardnumber="(cat /proc/asound/cards | grep "\[Dragon" | tr -d " " | cut -f 1 -d "[" )"
2. Setting DF analog volume control from commandline with alsamixer/amixer
amixer -c $cardnumber sset "PCM" 50%
replace $cardnumber with result from 1.
and "50%" with value from range 0%-100%
or use alsamixer
alsamixer -c $cardnumber
3. Differentiate DF v1.0 and v1.2
"bcdDevice" variable shows DragonFly revision
[root@abcde ~]# lsusb -vv
Bus 002 Device 002: ID 21b4:0081
bDeviceClass 0 (Defined at Interface level)
iManufacturer 1 AudioQuest inc.
iProduct 2 AudioQuest DragonFly
iSerial 3 (C) 2013 Wavelength Audio, ltd.
4. For those running squeezlite, below line will make the DF fly:
squeezelite -o hw:$cardnumber,0 -m xx:xx:xx:xx:xx:xx -a 40:4:24_3:1 -n squeezefly -b 60000:200000 -p 90 -r 96000