You will not be disappointed imo. AGD implementaion with sound signature like this best its budget predesessors in various delta sigma iterations.

+2 Value for money at this price, great for a alternative setup. I ll put my Money on its bigger brother pending further developments. .

I would advise you to follow your heart to get that dac you wanted most, once and for all, rather than you save cost now and having second thoughts later. You know better what is a good match with your gears, Stay cool headed and save up more in the mean time.

Some people swear by nos dac with its detail organic sound, good soundstage etc. provided it is well implementated. Both nfb1 and 1s are almost similar in design, just cheaper and slight differences in sound presentation. The main differences is probably at the psu design and parts used which is...

nfb1s is a NOS, non upsampling dac.

Everyone hears differently. Dependent on how loud you like your music genres to be. Will not be an issue with with volume level over 20 steps, high gain mode. Low level listening might sound flat. Best to be wired in balance mode.

With implmentation of amanero usb in full force now, his dsd ctr cable will be a thing of the past soon.

M7 and DI will enable you to play around with i2s. But with m7 +amanero usb, you wont need DI if you are using usb only. Kingwa should agree amanero usb is now functionally better than usb32.

You could have got your set yesterday or today already if you resent again. You should received a auto reply if someones actually reads your email. I Suggest you sent an email again to the other address with a vip word in it, Attentioned to Grace.

New version nfb7 2015 with amanero usb is ready. M7 as well.

Specs aside, nfb28 can power he6 very well, quantity and quality. You definitely had to turn up the volume higher to match any headphones, and to appreciate it. We all hear differently, so it will be up to you to play with different modes, volume steps and components matching on/ with the nfb28...

NFB28 is close to the NFB7 tonally. They had that sabre characteristics, NFB7 being a flagship dedicated dac, of course has an edge of being more extensive highs and lows, and spacious soundstage. NFB28 in this case actually sounds slightly warmer, less treble happy, probably due to being less...

You might want to check out nfb10.33 if you want warmer. An alternative to nfb28 with dual8741 dac.

It has not cause any issue with all my agd gears.

Sounds great to me with he6 and 400i.