USB to AES converter / DDC

I am unclear why you need the Trinnov ST2 hifi in between a server/streamer and a DAC?

Simpler options to convert USB out on your streamer to digital in on your Trinnov if using a coax input would work and there is no reason it wouldn't as well as AES. I asked Innuos for a recommendation for a USB to Coax converter and they suggested HiFace2 USB to S/PDIF converter from M2Tech. Limited quantity and only available in the USA. I ordered one but my Streamer has not been delivered yet so I haven't tested it.

@fastfreight  I use the Trinnov as a Digital Room Correction but only in the digital domain, it must be one of the best DRC engines around.

I use a Mutec  mc3+USB reclocker.    

Works great , it can accept USB ,AES, Coax, Toslink, and output any input simultaneously across all inputs.    It's worth a look for your application 

I picked up a Singxer SU6 awhile back and was impressed with the output. It is a good value. The Mutec looks interesting, but I have not heard it.