Audio-gd NFB-2 and NFB-3

General Information

Dac19 series Dual WM8741 D/A converter providing an USB and SPDIF input (coax and optical). It has a fixed level, single ended, output with regular RCA connectors and Audio-GD's propriatory ACSS connection. The latter is current instead of voltage based.

The DAC is characterized by extensive power regulation, discrete analog stage and high quality components. The difference between the NFB-2 and NFB-3 are well described on the Audio-GD website. It boils down to lesser quality power supply and capacitors for the NFB-3.

Briefly after release the standard digital input IC was changed from WM8416 to WM8805. This newer Wolfson design provides much better jitter rejection. Still the DIR9001 IC, which some regards as still better than the WM8805, is available as an option.

Latest reviews

Pros: Smooth, detailed, lush mids, impressive bass and very wide and deep soundstage
Cons: OK-ish USB input
UPDATE 23/3/2015:
I'm still using this DAC which makes it the longest used digital component in my system to date! I will probably be upgrading to something new as a streaming solution, but this will almost be an order of magnitude more expensive (> EUR 4.000). The fact that I haven't found a meaningful way to upgrade in the mean while and anywhere near the price is a strong testimony to the quality of this DAC in conjunction with the SBT.
======================================== Original review ==================
I bought this DAC as an upgrade from the Maverick Audio D1 that I've used for the past year in my main system. I really liked the NFB-2 from day one so I decided to put a bit more effort into writing a review. In order to get some 'old world HiFi' reference point I extensively compared this DAC to an Arcam CD37.
The test setup can be found at the end of this review.
The NFB-2 is solidly build. All connectors and switches have a quality look and feel to them. Connectors are good quality and perfectly fit the WBT connectors on my cables.
View attachment
The PCB layout and wiring is well made with attention to detail. The high quality components such as Wima capacitors and Vishay resistors are pretty unique in this price range. I didn't feel the urge whatsoever to grab my soldering iron and start 'upgrading'  some key components:)


I've mostly listened to the NFB-2 with my main speaker system using the SB Touch as source. I've compared it to an Arcam CD37 and my TC-Konnekt  D24 and Maverick D1.
My initial impression was something like: a warm sounding DAC with an impressive soundstage, lots of micro detail and a well defined and extended bass.This first impression was mostly confirmed over the past few weeks of listening and comparing.
Timbre/tonal balance
The NFB-2 has an overall smooth/warm character. My main system has a relatively bright character and my STAX SR-404 is quite neutral. The NFB-2 proved to be a great match for both systems. 
Its always difficult to use particular words to describe tonal balance. In this case warm does not imply particular coloration in the mid-low frequencies or top-off highs. Its much more the absence of any sibilance or ringing in the mid-high frequencies. The female voices of Jenifer Warnes, Ana Caram, Rebecca Pidgeon are beautifully represented. Jenifer Warnes does not have the sharp edges in ' Song of Bernadette' that I've heard in many systems. The soprano vocals and strings in the Bach recording show great extension, but never get edgy or grainy.
This even gets better with 24/96 recordings. I have the song 'Spanish Harlem' both in 16/44 and 24/96 the original CD version sounds great. But the 24/96 opens up a whole new dimension in terms of micro level detail but also in smoothness and HF extension. The passage where the violin starts playing (at 1:48) is a nice example. The NFB-2 shows superb extension and detail without ever getting harsh. And the improvements that HD provides are more significant then when using my TC-Konnekt or D1.
This is a strong point of the NFB-2. This DAC provides bass with very deep extension, great detail and control and some serious weight. I've never heard all these qualities in one unit at this price range. The CD37 is perhaps slightly better, but at more than 4 times the price! The D1 lacks the extension and weight. The TC-Konnekt does provide some weight, but at the expense of definition.
The bass line intro of Spanish Harlem shows no resonance or coloration. The  bending on the bass table on Ganges Delta Blues from Cooder and Bhatt is reproduced with great precision. And the 'genie'  on Three Wishes of Roger Water rolls over the ground with an unmatched impact. 
The midrange is where my NFB-2 improved most over the last 100-200 hours of playing. Initially it was just nice, nothing great. Over the past week I've heard it evolve into a very lush, open and dynamic midrange. Vocals, guitar and sax have a tangible quality to them. Jennifer and Sara K stand nicely in front of the soundstage, without being blown into bigger than life proportions. This is also the part where IMO the NFB-2 outclasses all 3 other sources that I compared it with. It is in a completely different league than the TC-Konnekt and D1. And it outperforms the Arcam by some margin. It almost has a tube-like presence and warmth, but without the coloration (often resulting in 'bigger than life' vocals and saxophone) that usually comes with that.
High frequencies
HF is smooth and extended. This can be particularly noted on the Matheus Passion and the higher pitched voices on the Chesky album Cymbal crashes and Hi-hat strokes are open and bright with good attack. Even while the overall tonal balance is smooth and warm, the highs have great extension and refinement.
Soundstage and precision
The NFB-2 provides a very large soundstage. Wider than I've heard before on my system. The CD37 gives slightly more depth, but only at 16/44 recordings. When switching to 24/96 (on the Ry Cooder album and ith 'Spanish Harlem') the NFB-2 wins hands down on all spatial aspects of the sound stage (width, depth and instrument separation). The background sounds/noises on the start of Spanish Harlem give some beautiful cues about the size of the room. The voice of Livingston Taylors is warm and has a chesty low end but is also very detailed. Articulation noises are clearly presented. The breathing, the lip noises and the airy quality of his whistling are fascinating to listen to. And I have not heard it in this detail before on my main system or my Stax.
I used the SPDIF Coax input with the Logitech Touch as the source most of the time. My NFB-2 has the WM8805 digital input receiver, and I have not compared it to the DIR9001. Many headfiers say that the DIR9001 is notably better than the WM8805. I also did some testing with USB and Optical.
View attachment
NOTE: the front pannel has DAC-19 as type, but the DAC is actually a NFB-2. Audio-GD had some face plates left and used them for the the first production run of the NFB-2.
Both USB and Optical where less good than SPDIF Coax. When compared to the D1 the NFB-2 clearly has a better USB receiver. The difference between the two DAC's is bigger using USB then when using the SPDIF input. The NFB-2 does a much better job here.  The same is the case for the Optical input (source being a rather jittery MacBook Pro). 
I also tested the NFB-2 while using my TC-Elektronik as a FireWire to SPDIF converter on my Macbook. This combo resulted in a slight improvement of the spatial imaging and HF refinement compared to the SPDIF output of the SB Touch. But I had to switch back and forward several times to hear this. In the past I've come to the conclusion that the TC-Konnekt is a high-quality SPDIF source. Based on this I draw the conclusion that either the NFB-2 has a pretty robust SPDIF input or the SB Touch also has a high quality SPDIF output.
Conclusion: the USB input is not bad at all, but no match for the SPDIF-Coax (when using a good source!). And the TC-Konnekt is a much better computer-SPDIF interface than the built-in part of the NFB-2, though with a less versatile FireWire connection. 
View attachment
Overall Conclusions
This is a great DAC at this price point. It matches perfectly with my main system and my Stax phone. In particular at this price level. I've compared it directly with an Arcam CD37 in my system. I found this a very intriguing comparison. I've always found the Arcam CD players to be high performers. The CD-37 uses the same DAC topology (dual WM8741) which makes it an interesting reference point. Compared to this player the NFB-2 is overall at the same quality level. The NFB-2 has slightly more open and transparent mids and the CD37 a bit more refined highs. When using HD material the NFB-2 wins hands down.
The comparison with my Maverick D1 (using OP249) and TC-Konnekt D24 is really not fair. The NFB-2 is in an entirely different league in almost all aspects (bass, mids, spatial imaging, detail).
My most notable conclusion is in an entirely different area. I've had various discussions with friends lately about streaming audio. They are convinced that it can't get anywhere near a good CD player. My newest setup (SB-Touch > NFB-2) has convinced me that streaming audio can be at least on par with a high quality CD player. And even improve on it when play the HD version of the same recording (which the CD-player is simply not able to playback). It all depends on a good transport/source (which the SB Touch clearly is) and a good DAC. 
The strong points  of the NFB-2 are:
- smooth sound without missing out on detail
- fluid mids
- weighty, well defined bass
- the widest sound-stage I've heard to date
- great on HD material
I haven't really found any clear shortcomings. In particular when considering its price. Perhaps in some systems that are a bit bass heavy, the bass of the NFB-2 might be a bit too much. And if you want to make maximum use of the NFB-2 with a computer source, it pays off to invest in a USB>Coax interface such as the Audio-GD DI. As a secondary input the USB input of the NFB-2 is quite OK.
I think this DAC will prevent me from upgraditis for quite some time to come!
Test setup
  1. Logitech SqueezeBox Touch
  2. Macbook Pro > Toslink
  3. Macbook Pro > TC-Konnekt > SPDIF-Coax
  4. Arcam CD37 > SPDIF-Coax
  1. Preamp: DUSON C1000
  2. Power Amp: DUSON A-10
  3. Loudspeakers: Epos M22i
  4. Cables: Straightwire Rhapsody interconnect, Van den Hul Videolink digital interconnect and Nordost Blue Heaven LS
  5. Phones: Stax SR404 + SRM-Xh (I've sold my SRM-1 and use this for the time being) and some occasional listening with my Shure E3c and AKG K271 (trough the C1000).
  1. The worlds greatest Audiophile vocal recordings - Chesky Records 24/96  (Rebecca Pidgeon, Livingston Taylor) / Rebecca Pidgeon also on 16/44
  2. Jenifer Warnes - Famous Blue raincoat ('07 edition) 16/44
  3. Ry Cooder & V.M. Bhatt - A meeting by the river 24/96 & 16/44
  4. Roger Waters - Amused to Death 16/44
  5. Mattheus-Passion - Philippe Herreweghe - Harmonia Mundi 16/44
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Are you reviewing a NFB 2 or a Dac 19?
Your pictures are showing a Dac 19, that cost 4 times the price of Tubemagic D1. Sure he can allow himself to be better...
I'm quite disappointing, i'm hesitating between a Tubemagic D2 and a NFB 2, you really convinced me with the bass extension of the NFB 2 till i notice it is a Dac 19 on your pictures.....
Ok my mistake!!
First for the price range i confused the NFB 2 and 12, and add some reading i get that the design have change and the old one look alike the Dac 19. I think i gonna go with NFB 3.1 for what i read about...
Thanks for the review
I was about to point you to that!
Good that you found out yourself. It can be quite confusing.
I'm still very happy with my NFB-2. Its one of the pieces of equipment that I've kept for the longest time recently!


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