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When I have adjusted a filter I push the "set target level" and it says 73.5, maybe
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You shouldn't really push "set target level" after adjusting a filter. Once all the filters are set in you BFD and you want to check your work, you must go through the whole REW check levels setup again (which takes seconds when you're used to it).
Anyway, now that you have added your mains, you can see that there is a bit of a difference in the wholesale level betwen the mains and sub. The sub loudness needs to be adjusted up a bit using the subwoofers own amplifier volume control. Turn it up a bit and do a remeasure so that the sub and mains are at a more even level. (Some people even like the sub a bit hotter than the mains)....
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Here's a bit of a rough step by step of the setup once the soundcard.cal and meter.cal are loaded and the cables are all hooked up and ready to go..
To go through these steps only takes a second......
1. Run the Check Levels routine (in Settings icon) selecting Check/Set Levels with Subwoofer in the Levels pull down box, with the SPL meter at the listening position and the dial of the meter at 80dB position (or whatever scale allows 75dB to be measured).
Ensure the REW output VU meter is at -12db and the sweep level at -12dB.
Set the Wave Volume at 1.000 and the Output Volume about ~0.500.
Then adjust your receivers volume control so the actual standalone Radio Shack SPL meter reads ~75db at the listening position.
Then adjust REW Input Volume to end up with -12dB on the REW input VU meter.
2. Run the Calibrate SPL routine (in the meter tab) to match REW's SPL meter to the real SPL meter to ~75dBSPL.
3. Run the Set Target Level routine, which will set the target to ~75dB.
4. Run the Measure routine and set the End Frequency to 200Hz for subwoofers.
5. Measure.................... (use a larger number of sweeps and longer length for more accuracy and less noise)
6. Using the Graph Axis Limits icon, set the vertical scale to 45dB to 105dB and the horizontal scale for subs to 15Hz to 200Hz.
BTW, your response is starting to look real good. Only a little bit of work left to do....
brucek