Fully balanced design built by discrete analog stages without any OPA and couple caps in the signal channels.
Non- feedback ACSS analog output stage .
Uses three R-core transformers (135W total) separate power supplys for the digital part , right channel and left channel.
More than 50,000uf audio grade NOVER capacitors are used to ensure ample and smooth power feed.
A total of 11 class A PSU groups are used to purify the power supply. To achieve high S/N, the control circuit is powered with separate regulator.
Uses most Hi-end grade parts and exact match transistors.
Four-channel digitally controlled relay-based volume control to avoid channel imbalance and improve sound quality. NFB-27 has 99 steps volume level control in both high gain mode and low gain mode.
5 groups digital input : BNC / BNC+RCA coaxial / RCA coaxial / Optical / USB
3 groups analog preamp input : XLR / RCA / RCA
Preamp / DAC output : XLR / RCA / ACSS (variable)
Headphone output : 4 pins XLR / 6.3MM SE
USB Audio Class 2 High-speed Input from Windows / MAC / Linux
The USB supports High / full speed Asynchronous Transfer Mode up to 384K / 32Bit ability .
Resolutions support 16 / 24 / 32 Bit with sampling rate support 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
Robert from Germany:
I'm glad that your NFB27s are fine!
I will surely come back to you with a new order sooner or later.
By the way, I think your USB-32 implementation of the VIA Envy chip is the the best I have ever heard. No chance for M2tech, XMOS etc.