I still not quite understand about the use of the current switch-the Class A switch. the gain pump up the volume, Class A switch pump up the power, right? if we pump up the power, does it pump up the volume too? and so, is it just similar between the gain and the class A switch? sorry for...

I just ordered the B1, hope it'll be arrived within a week...Cant wait to try this amp... Does anyone paired B1 with DX90?Now I only use the DX90 directly to Westone 4r and Grado Sr325is (modded) I dont think that I will need to switch on the gain cuz my cans are low impedance. but... Do I...