voltage matching

I'm talking about RCA/XLR line out/in. But from the beginning I have home theatre setup with adam t5v as LR, amp for the rest of the speakers and Asus Xonar u7 mk2 dac. At first there was issue where t5v's weren't getting loud enough at full volume on the DAC so i bought some cheap chinese...

I'm working my way through the settings on a new Hifi Rose RS150B and I'm a little confused while trying to match the Rose's analog output voltage (adjustable) to the max input voltage on my Yamaha A-S2200 (integrated amp) balanced input. The spec from Yamaha reads like this: Input Sensitivity -...