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Blue = Phase @ 0, Orange = Phase @ 180
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If these are sub only frequency response plots, you do realize that phase has no effect until the mains are added? Phase has no effect on a single speaker. It affects the way two speakers interact at their common frequency areas (i.e. crossover).
The smoothing feature is for plots that are above the ~200hz range since comb filtering tends to make the plots unreadable. You require the smoothing to get a feel for the underlying trend of the signal. You don't use smoothing on subwoofer plots.
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My plots are a mess and nowhere near a nice as others ive seen here.
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I think they look great. You could use a little equalization on the last plot to lower the reasonant peak, but other than that it's pretty good.
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Does my sub suck, my room suck, my AVR suck
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They all look fine to me. It's usually never an AVR problem (other than not set up properly with respect to crossovers etc). To determine what the sub can do without the room you can drag the sub into an open area (middle of the room away from walls), and do a near-field measure. This will reveal what the sub is like without the aid or hinderance of the room. Then place the sub into its corner and take a measure at the listening position and see what that pesky room is doing.
brucek