[brucek]

I'm using REQ testing the subwoofer and after clicking on Set Target Levels, it sets a cutoff of 80 and a target of 73.7.

It's up to you to set the cutoff that you want - not REW. Set it to the crossover frequency of your processor/receiver.
The target will be approximately at the level you originally set when you adjust the A/V volume during the setting of the Measurement Level on the SPL meter.

Do I store these cuts and then re-equalize to fix the small peak at about 52 Hz and so on?

No, you accept and use the suggestions and then add your own by entering them into REW at that time to see how they look on the REW screen and then enter them into the BFD.
Now you can remeasure and tweak.

I wasn't able to get the soundcard calibration test of the left channel to work right

You did use a loopback short from line out to line in?

my first graph was done using a 1/6 octave sweep since that is what I saw posted on a lot of graphs and since I thought a slower sweep might be more accurate.

No, the full sweep from 10-200 is the most accurate.

Obviously - this graph requires a lot more filters and shows a ton of dips. Is there anything that can be done to fix dips?

Yep, you can use a filter with gain. But realize it eats headroom from your subs amplifier. Small gains are fine if they work. Some dips defy any repair as revealed by the fact they won't respond to gain.

You can also apply some trace smoothing to remove sharp spike dips that can usually be ignored anyway.

but perhaps REW doesn't keep the changes as defaults when entering / exiting the program

It stores them in the Axis button that can be applied any time. As soon as you measure outside the setting, the graph axis will change to accomodate. Simply press the Axis button to return your default.

Perhaps that is why the spl of the desired response starts in most cases around 85 dB rather than the 75 dB of those posted with REW

Best to use 80db since the SPL meter movement will be centered at 80.....

When I loaded some of the parameters listed on this forum for house curves into REW, the desired house curves all started quite higher on a dB basis in REW effectively creating more spots below the desired curves (boosts needed) rather than response above the curve requiring cuts needed

Just adjust your measurement level higher and then cut down to the target.

Are the curves entered differently for REW, or alternatively do I disable the Radio Shack meter calibration or instead try running REW at 75dB go to 85 dB?

Simply put a simple housecurve file into the REW directory. Call it housecurve.txt
A simple one that rises from 80Hz by 5dB until it hits 30Hz would have two entries in the file.
30 5.0
80 0.0
Start REW, select FILE and Load Housecurve. That's it. It has nothing to do with the RadioShack calibration file (other than both files are stored in the REW directory)....
Once the housecurve is loaded you'll see it in the target response.

brucek