I started from scratch this afternoon. I've got about 30 measurements saved in REW with various crossovers and sub distance settings, with and without Audyssey activated. My goal is to find the best setup with Audyssey activated and a crossover at 60Hz. I'm not quite understanding why my 60Hz and 80Hz graphs are differing the way they do. I've taken multiple measurements at 60Hz with sub distances varying from 6ft, all the way up to 14ft, and it seems that 8.5ft is the lesser of all evils at 60Hz.

First, I measured the sub response with no filters or Audyssey activated, and without the mains connected. I don't recall the sub-distance set in the AVR, but I'm not sure if that makes a difference (although I believe it was set to 14ft in AVR).

Settings: No Audyssey, Sub alone, 120Hz crossover in AVR

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Then, using the Behringer Feedback Destroyer Pro DSP1124 parametric equalizer:
Target setting: flat curve (speaker type set to: None)
70dB target level
Filter Task: match range from 15-80Hz

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Settings: No Audyssey, 80Hz crossover, sub distance 14ft



Ok, looking good so far, but then all hell breaks loose after Audyssey auto-calibration enters the equation....
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Note: Audyssey makes the following changes (unfortunately I don't recall Front distances in the non-Audyssey measurements)
Front levels -0.5dB
Sub level -4.0dB
Front distances 9.0ft
Sub distance 14ft



Settings: Audyssey, 80Hz crossover, sub distance 14ft


Still not too bad, but I really wanted to use a 60Hz crossover to take advantage of the Sierra-2's range and essentially eliminate any potential for sub localization.
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Settings: Audyssey, 60Hz crossover, sub distance 14ft

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Settings: Audyssey, 60Hz crossover, sub distance 8.5ft






Among many things, I guess I'm not understanding
1) Why am I getting such a large dip at 45Hz when switching from an 80Hz crossover to a 60Hz crossover? :dontknow:
2) Why is the activation of Audyssey introducing a rising slope from 40Hz to 80Hz in graph #4?
3) Is there something else besides distance/phase delay that can be changed to better integrate the sub/mains?