Just fired up my newly built Stereomore (3 watt design). Right now I am just running it into my B&W 803 speakers (90db efficiency) and at full volume from the source (PS audio Perfectwave DAC) and on the amp, it has a pleasing sound and comfortable but not floor stomping volume (of course) like I get through my usual Plinius SA-102 at 125 watts. I am thinking of building some 7 PI speakers which are corner horns with 101 db efficiency but I would like to know what others use.