IF your source come with built-in volume control, you can connect it to the minidsp input, the output of the minidsp connect to one of the line level of the Rega Brio. Set a fix volume of Brio to 12 or one O'clock, then use the source volume control for volume level adjustment. ( Same as HT set up if the integrated amp dose not equipped with pass-through )
Source --> minidsp --> integrated amp
l
l ---> active subwoofer
Source --> minidsp --> integrated amp
l
l ---> active subwoofer