Hopefully this will help:
I have owned both the ST-10 and IDA-16. The ST-10 wasn’t powerful enough for my 82.5dB speakers, so I sold it. I no longer recall its sound. I had the IDA-16 in my bedroom for a couple years and quite liked it in that room. I bought an EVO STA (dual mono) about a year and a half ago, and the other two amps simply don’t compare to it. I love how it sounds (and looks). I’ve paired it with a tube preamp as well as a Dac-9x, and powered 96.5dB and 87dB speakers. It is an excellent amplifier.
Michael