Hi All, I am new to this forum and these HiFi stuff. I am planning to buy DAC + power amplifier + speaker for my small living room. DAC probably something from Topping. I only have space for bookshelf speaker (something like Dali Oberon 1). For power amplifier, I am interesting in those Ncore model from audiophonics.fr but I don't know which one (power) should I choose. From Amirm's review, seems DAC performs best with 2~4Vrms output voltage (XLR). I tried to calculate the amplifier output power range with 2~4Vrms input with the equations on the specsheet of NCXXXMP and then calculate the speaker SPL with dpeaker spec. However, the amplifier output power seems way too high. I think maybe I don't understand the equation correctly. Can anyone show me an example on such calculation? Or the math I am doing is useless for selecting an amplifier?