So aparently Audio-gd Is coming out with yet another new Balanced DAC. basically this looks like a NFB-17 on steroids with 4x PCM1704UK instead of dual WM8741. Considering how well regarded the Ref7.1 (8xPCM1704) and DAC19 (2XPCM1704) are i am willing to bet that this thing is gonna be awesome. Balanced and 4XPCM1704 for only $900? not bad if you ask me, considering the PCM1704's alone cost $200. http://www.audio-gd.com/Pro/dac/RE5.2/RE5.2EN.htm here is king-wa's description: Copy but Upgrade from Reference 5 : 1, 5 groups input . 2, Refer to Reference 7.1 fully balanced design, even connect RCA output , all PCM1704UK working for RCA output , had more neutral sounding . 3, 192K/24 Bit support by USB, coaxial inputs . ( The SPDIF input module can be replace , default install WM8805 for 192KHz support , USB always support up to 192KHz ) 4, High / Low output level select . 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 R-core transformer . More than 20,000uf audio grade NOVER capacitors are used to ensure ample and smooth power feed. A total of 4 groups class A PSU and 4 groups linear PSU 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. 5 groups digital input : coaxial *2 / Optical *2 / USB Preamp / DAC output : XLR / RCA / ACSS USB Audio Class 2 High-speed Input from PC/MAC Supports full speed Asynchronous Transfer Mode Resolutions support 16 / 24-Bit with sampling rate support 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz ( USB model) Supports up to 24Bit/192KHz (coaxial / USB ) The DSP-1(V5) digital processor can supports NOS, 2X, 4X and 8X oversampling customers setting. Memorizes all settings and it could resume the last settings when power on. What's different between NFB-17.2 and Reference 5.2: TI want to discontinued PCM1704 but there are still a lot hi-end fans love the real sound of the PCM1704UK. The Reference 5.2 built in 4 pcs PCM1704UK which is cost USD 48 /pc from TI and USD70 / pc from market , cause the Reference 5.2 price costly than NFB-17.2 , and we can't confirm when it will discontinued . The NFB-17.2 sound : "Neutral but smoothness sounding ,it doesn't sound skeletal or digital (or metallic). There's meat aplenty on them bones . It's a sigma-delta DAC chip implementation without the dryness, neutrality without the emotional disconnection" - John Darko The Reference 5.2 sound dead neutral and monitor .