Greetings: I already set up my minidsp2x4hd processor crossover pretty easily. Got the crossovers working as expected, etc. Now, regarding the REW setup I am having problems. I am not able to get to first base in that I have not been able to get the sweep tone in my loudspeaker system. The Mac laptop has the Sierra operating system. I supposedly identified the appropriate input and output in MIDI and Sound preferences as the Unik mic and dsp hd respectively. If I tell the mac to use the internal speakers and specify defaults in the REW program I get a tone thru the laptop speakers. But when I try to set it up to get the test tone thru my stereo loudspeakers there is no sound. I have tried all kind of combinations identifying the minidsp and the Unik mic, etc. in the preferences page. Obviously doing or identifying something wrong or missing a step. There must be someone out there using the Macbook for this. It looks like all the tutorials I have seen use Windows so I am not getting all the info. I need for my Mac setup. Help will be appreciated. Thanks.