Anyone in the US willing to loan Amirm for testing any of this 2 highly praised top performers, now a little bit old so the price has dropped considerably.
iBasso DX90, reference DAP for the time (circa 2014/2015) uses dual mono
ES9018K2M chip, OPA1611, dual buffer BUF634, LINE OUT 1.761 Vrms @0.0011%
Yamaha RX-Z9 (USA) / Yamaha DSP Z9 (Europe), 2004 released, Top Of The Line (TOTL), “Uber” A/V multi-channel amplifier costing the whopping US $4,500-$5000....pretty much the very best amp made by Yamaha
Now selling between 500-1000$....
*Class-leading low-flux,
1,500 VA Toroidal Power Transformer.
*A pair of high-grade
Nichicon 28,000uF/ 80 volts power capacitors.
*The absolute best quality Nichicon Fine Tune capacitors specifically designed for high-end audio are used in all circuit boards.
*Speaker relays with gold plated crossover connections and shielding.
*24-carat hard gold plated extruded, large 2-way speaker terminals.
*Use of super-expensive, ultra exotic, best at the time Burr-Brown DACs on all channels.
PCM1792 DBR