Does 24/192 work in Audio Note NOS DAC?Mattzack2

I have an Audio Note DAC (non-oversampling) that only has USB and SPDIF RCA inputs. Originally I only connected my mac mini directly to the dac with USB. The mac mini did not have an rca output. I bought a cheap little USB to SPDIF converter that I could send data at 24/96 and noticed an improvement using a digital coax to the dac.

I am expecting delivery of a new USB/SPDIF converter that does 24/192 and 32/384.

Is there a limit on the coax input of the dac? Will the NOS characteristic of the DAC come into play, limiting the dac to accept anything beyond 24/96 or will the 24/192 SQ better the 24/96?