Quote: I asked the same to Audio-gd one year ago. Here is their answer: "The old NFB12 was set to 2X oversampling, filter 3."

I just finished the break-in of the A1-Gold. I have the naked card, still to be put in a case. I 100% agree with the impressions of Sarals. This amplifier has a lot of muscles!  I tested it with Superlux HD662 and HD668. The sound is satisfactorily clear and detailed and the dynamics is...

Quote: Interesting information. Thanks! Anyway, I'm not surprised neither reactive about that. Many widely appreciated DACs use (lousy) opamps in the output stage to filter/amplify the signal... At least in NFB-12 there are no caps on the path.   P.S. IMHO and according to my...

This DAC + headamp is on the market since a few monts.         Four switchable inputs (optical and S/PDIF) Output: RCA Up to 24bit/192KHz Built-in headamp No capacitors on the signal path     Information in the website of Beresford: w w w. b e r e s f o r d . m e  ...

A specific contribution for the owners of DACs that have inside the chip TENOR TE7022L and  still use Windows XP. At last I found an ASIO driver - instead of the not so satisfactory ASIO4ALL - that can works flawlessy in Windows XP: I tested it in connection to Audio-gd NFB12 and Prodigy...

@brandon4ek The site currently works fine for me. They just published a new version (V 0.02) of Maiko MonkeysAudio decoder.

Quote: See my mod here: http://www.head-fi.org/t/604787/superlux-hd668b-a-tweak-for-some-more-comfort  

I don't know if it's possible to replace the pads of the wings. But surely you can very easily replace the earpads of HD668, HD662 and HD681 with the ones of the AKG K-240/270/271 (e.g. you can see here). I did that with a big improvement in comfort. In my lousy pictures, above, it's...

You can download the datasheets of the Tenor chips from the manufature's website, Galaxy Far East Corporation:  http://www.gfec.com.tw/tenor;jsessionid=3716E1269CF40555F14E29D41DDD341F

Quote: In Audio-gd's website the NFB-12 is not in the list of the DACs that can have that upgrade. And looking at the pictures the upgrade needs some DiY skills. But there are several Asynchronous USB external transports already available (e.g. WaveIo, Aqua, Hiface...) and more and...

See my "Comfort Tweak" here: http://www.head-fi.org/t/604787/superlux-hd668b-a-tweak-for-some-more-comfort   @Proid: thank you for your very useful suggestions! 

Great job, BleaK. Thank you! Being a keen user of Winamp, you have brought me the last missing piece to forget Foobar without any regret  The plug-in is rock solid with the Tenor TL7022 transport (used in Prodigy Cube and NFB-12 DACs). 

Thanks! So simple, so effective. 

Quote: I asked to Audio-gd a few weeks ago. Their answer was: "The old NFB12 was setting at 2X oversampling, filter 3." That means  2X oversampling , Linear phase 'brickwall' filter.   

I keep on liking these headphones, that gratify me with a good deal of good music. But I don't like at all their little wings, Audio-Technica style: they press too much on my parietal bones and don't give enough support. So, after some time, they tend to slide down and to compress the upper...

I currenly use the LM4562. Very good dynamics and clear sound. I tried OPA627 but my ears did not like it. Its sound was not brilliant as I expected. I would define it "boring" :-)

Thanks, KimLaroux! Your solution of drilling the bottom of the case is simply brilliant! Actually the impressive heat of NFB-12 worried me a bit in the beginning. I've been reassured by Kingwa about its harmless. Actually I found that most of the heat is generated by the voltage...

Hi. I'm another happy owner of a NFB-12.  After reading around and having done some tests I'm currently using it set to 4X oversampling , Minimum phase 'soft-knee' filter. I'm curious to know which filter other owners prefer (and why). Thanks.