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I'll sneak in here while our American friends are sleeping
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No fair using the fact that the world turns to get in ahead of us.....
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apply a massive narrow cut centered on 16Hz,
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As Chris says, the lowest filter allowed is at 20Hz, although it extends as any filter would above and below the centre frequency. On this same issue, I guess your concern is that you don't have a subsonic filter and you want to limit, so as to protect the sub? It looks like it's naturally rolling off, so not likely a concern.
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Adjusting a filter, running a sweep of test tones, typing the numbers into a spread sheet as you go, is slow.........................
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Again as Chris says - get a PC for pennies anywhere. My main computer is the latest and greatest, but my REW computer is a old 350Mhz PC that I added some extra memory to. It runs REW and Excel fine. They're literally giving them away....... No one wants them and they are ideal for REW.
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The real sod is 'D' around 100Hz.
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I guess this is a sub + mains response issue you're referring to? Sometimes you can make large cuts in the sub at these higher frequencies, although by the time the sub is at 100Hz, the crossover has lowered the level so its influence on the overall sub + mains output at that frequency is much less.
Also you may attempt changing the phase of the sub. This has its affect around the crossover (which 100Hz is certainly a candidate). Of course if you had REW you could just flick the phase switch and watch its affect.
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If anybody has any suggestions based on this graph
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Modify it to be ~45Hz to 105Hz.....
brucek