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I would assume that I need a high pass filter for the mains or a low pass for the sub.
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Well, for two channel listening I would go for the mains receiving full range and a low pass for the sub. You would adjust the low pass to provide just enough bass at the lower frequencies to complement the low end roll off of the mains. Most subs come equipped with an adjustable low pass filter (that can be switched out or dialed high when using regular processor bass management). If you had capable mains, you might only need the subs low pass crossed at 35Hz or 45Hz, just to boost that very low end stuff leaving the rest of the duties to your mains.
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will have to drop the sub to -9 to see where it's at, and it should be played at -9. Is this correct.
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You're making it a bit too complicated.
First set up the sub and speaker trim levels so they sound balanced to you when playing a movie or music - then don't touch them or your subs amplifier level.
Then adjust the overall master volume of the processor/receiver to set the level you like for frequency response measurements - whatever that is.
Love those sideways graphs - doh, I think I hurt my neck.....
brucek