Audio GD , The Master 7 Monster 8PCS PCM 1704 DAC , have achieve many good reputation in many reviewer. with so many revision from the usb port. from usb32 to u8, now new Amanero. every usb change make the sound more and more better. In 2016 , Audio GD Released It's New NOS 7 DAC. With New DSP Software design Two option NOS modes, support up to 768KHz input, Asynchronous clock , FIFO data process. Built in 8 PCM1704UK. The Different between Master 7 and the new NOS 7 in Audio Gd website The Master 7 had the 8X times oversampling and NOS mode can be selection . The NOS 7 had the more advantage algorithm than the NOS mode of the Master 7 . The oversampling design and NOS design had different sound characteristic ,it is not which is better but depend on customer prefer I never ever hear any nos or R2R DAC in my audio journey before. When searching for a Nonsampling Dac or Nos or R2R DAC , I found These New NOS DAC , I ordered it directly from China , after many question with The Man Behind this Awesome DAC "MR KingWa" the funny thing is Kingwa Once asked me . "If i really want this Nos Dac, Because the sound maybe not what iam looking for" these question make me more curious about this nos 7. in my audio journey , iam never ever try a nos dac. my all dac collection is all delta sigma dac from Centrance Mini,Aune X1 ,Aune S16, except Chord Hugo. So the Time is just so Right When this New Nos 7 released i think i will try it. I heard so many comments in headfi from some master 7 owner that the master 7 sound is so organic, so natural, these is the reason that make me want to try, What is organic, natural, sound people are talking about! The Input in the back, i ordered the HDMI I2S port BNBNC input, up to 24bit / 96KHz AES input, up to 24bit / 192KHz RCA coaxial input, up to 24bit / 192KHz optical input , up to 24bit / 96KHz I2S input, ,up to 32bit / 384KHz USB input, ,up to 32bit / 384KHz from left to right: Cayin A88T MK2, IFI Micro IUSB 3.0. 5V Linear Power Supply, Singxer F1 DDC USB to Coax, Dual Head DIY USB Cable OCC copper for data , pure silver for Ground And Power Hardware Setup 1. Pc Computer intel I7-4790K as source , foobar as player with asio output audio file mostly flac 16 bit 44khz loseless 2. IFI Micro IUSb 3. 3. F1 DDC Usb to coax 4. Cayin Tube Amp with 4 PSVane KT88 T2, 2Shuguang Black Treasure 6SL7 and 2 Shuguang CVT181-T 5. DIY Dual Head USB Cable with occ and silver gold cable 6. PSB Synchrony Two B Speaker I will do several Test with different Input and DDC. First I will try Usb Port Straight From Pc with dual head usb cable plus linear psu , Second will try it with IFI Micro IUSB 3.0 in chain Third will try with a new DDC usb to coax "F1-Singxer Xmos 208 Usb to coax" Last will try with IFI Micro IUSB 3.0 And F1 Combo i will update later the listening test . just wait . music for test iam a vocal lover most of the test with album from chinese female singer "Lei Ting"