I thought setting the crossover in the Anthem created a high pass or low pass whatever for the mains... i.e. setting the xover at 50hz sends nothing below 50hz to my main speakers.. No? So using the subwoofer management on my Anthem still sends full range to my speakers?
It is adjustable. You can set the HP filter on the mains (which ARC calls "Subwoofer Crossover Frequency") to FLAT if you like. That will run the mains full-range.
I suggest you try letting ARC set everything automatically before you do that, though. You can save that calibration file, then copy it to another name, re-open it, and adjust ARC settings ("Adjust Targets" for each of the four allowable profiles. That will let you compare easily.
To get access to all the adjustments, you need to run ARC on a computer (not a mobile phone) and in Professional mode.
As others have said, you will get better sound using a digital input on the STR, rather than converting to analog in the Lumin, converting back to digital in the STR, then using the STR’s DAC again to get analog output.
After you have a correction set up, be sure to run the automatic phase feature, which will give you the most even LF response for several octaves around the crossover area. Without it, you are likely to have nulls and peaks.
Many settings in ARC can affect the sound in ways you might not expect at first. For example, speaker levels have no effect if you are running corrections full-range. But if you’re not, they affect the relative levels of response within the correction bandwidth and outside it. Thus, a click or two change in levels can change brightness of the sound.
It will take some playing around with ARC and thought about what it’s doing for you to fully master it. Also (as has been said in many reviews of DSP products) if a listener is used to hearing bass peaks, it can take a while to adapt to sound without them.
HTH