Relevant links:

RMAA: MST Audio Chord Mojo-Kai (balanced) 24-bit
RMAA: Chord Mojo 24-bit
RMAA: nextDrive Spectra 24-bit
RMAA: Onkyo DP-S1 rubato 24-bit
RMAA: iPhone SE 24-bit
RMAA: Apple iPhone 7 24-bit
RMAA: 2012 27" iMac 24-bit

Spectra X is better than is predecessor. It measures better, sends less amp noise to headphones, filters better, and comes in the same slim package. It’s quite the update/upgrade from the same company within a year. The good news is that the original Spectra was so good that if you have it, you’re golden. If you don’t, X is a worthy investment. 

129$. 32-bit 384kHz. DSD up to 11,2MHz. All thanks to a plug and play ESS 9018Q2C DAC, or what a smarter man than me hooted and hollered as high quality audio for the masses.