Hello Guido, the NWO-1 was entirely single ended design with 10 DACs per channel and single ended output stage. The NWO-2 is all balanced with 10 x fully differential DAC design which equals 20 DACs per channel (10 + 10 in differential mode). The tube stage was also re-designed to differential mode featuring new output transformers. The NWO-2.5 has the same differential topology as NWO-2 but it comes re-designed DAC boards, re-designed Master Clock and additional PCB which allows for much purer digital signal path. Conversion of DSD to PCM is changed from the original 88.2K to 176.4K. Since the AKM DACs are capable of 216K input sample rate, all NWO players up-convert all formats to 211K.
Regards,
Alex
Regards,
Alex