You really should try HQplayer resampling all PCM to DSD 256. I don't think any PCM DAC can beat this technique regardless of price. You can't do better with a DAC than just having a simple lowpass filter. HQplayer does better SRC/SDM than any SDM/SRC built into DAC chips. When you combine the 2 systems, it's hard to beat.
But if you want the holy grail, install this reclocker board with ultra low phase noise clocks on it. This will launch it through the stratosphere. The GG just uses a plain old Amanero with mediocre clocks on it. With pure 1 bit DSD, the quality of the clocks become much more important. 1 bit data is very sensitive to jitter. This reclocker board reclocks the master clock, and filters out any noise coming from the connected computer. The best part is you can choose the quality of clock you want to use to feed straight into the low pass DSD filter in the Amanero. It's not hard to install. He has a version made exactly for the Amanero used in the GG.
The $485 is fully assembled including the Amanero. Since you have a Amanero already, it would be cheaper. He sells the PCB's for only $35 for anyone who can SMD solder.
https://sites.google.com/site/ackodac/home
2CH USB-I2S/DSD Audio Module-AKU384
http://www.diyaudio.com/forums/group-buys/227502-amanero-isolator-reclocker-gb.html
View attachment 23560
"High frequency Rogers board"
-HiRes, Bit-Perfect 32bits I2S - 44.1k, 48k, 88.2k, 96k, 176.4k, 192k, 352.8k and 384k
-DSD 64,128,256 and 512
-Based on Amanero and AKL-S03 Digital Isolator/Re-Clocker
-Dual Ultra-low Phase Noise Synchronous Audio Clocks
-Buffered Outputs on micro coax (u.fl) headers
-Direct connection to most DACs
-Drives ESS DACs in 'Turbo' Sync mode for the highest performance.
-All separate ultra-low noise (1uV rms) power supply and filters on board with very high PSSR
-Ultra pure 3.3V supply (<0.5uV rms noise) for Oscillator section. Options for external supply from batteries, etc
-I2C Port for reading sample rates directly from transport
-Led sample rate indicators on-board.
-Wide input supply 5-12V d.c. Regulated or unregulated
-Gold plated 2oz Rogers 4003 board
-Selection of finest components
-Assembled and tested
- built-to-order only ~4wks lead time
Unit Price: USD 485