the SIT3 only requires 3V to full output/clipping. most digital sources exceed that alone. It’s a low gain amp and low power, but should be able to be driven by most anything. I have a SIT3 on its way and will be pairing it with the PASS XP12.
I am currently using the XA25 with it. Was told I just need to turn it up higher than most other amps, yet it will still be all attenuation as I’m coming off a DAC in balanced mode, 6V