[brucek]

So you feed speaker level signals to your OM-6 as a full range speaker with intergral sub. The receiver is set to full range, so that means the LFE output of the reciever which feeds the BFD / Servo-15 and -kicker will contain no redirected bass except for specific LFE tracks on DVD's only.

That is a tricky configuration to setup. The much superior Servo-15 is doing nothing until an LFE track is encountered on a DVD. All the low redirected bass is going to the OM-6 subs. Those 8" drivers and associated amplifier used in the OM-6 subs don't hold a candle to that beautiful Servo.

As a test sometime I would suggest setting the mains (and all other speakers) to small such that LFE and all redirected bass below the receivers crossover of 80Hz went to the Servo and the OM-6's would get all the information above 80Hz. The subs in the OM-6's will still get information, just not the lions share. The BFD would then get full duty for equalizing all bass sent to the Servo.

Anyway, that's not what you asked. I guess from reading the manual that the LEVEL control is simply the balance between mains and the sub. If you want to have them the same level, you would set the level to zero. If you found them a bit boomy you could turn them down etc.... The level is really a wholesale control for the subs level and is not frequency dependant within the sub itself..
The EQ contol will modify the area betwen 20Hz and 45Hz with a variance of +/-3dB. It's a weak attempt at equalization in the area where it's usually needed. You can adjust it by ear or use REW software to be more accurate.

brucek