AVS Special Member
Join Date: Dec 2007
Location: Southern California
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With those speakers, the front speakers should operate well down to at least the 40-50 Hz range.
My guess is that the "rumble' is due to the output of the sub interacting with the output of the front speaker's 10-inch woofers.
You should set the sub to operate only up to around 40 hz or so to avoid overlap with the front speakers.
Adjust the subwoofer's upper frequency settting up and down between 40 and 60 Hz and play material with low bass until you get the best setting.