[brucek]

I think whether you consider it a bad thing or not is a matter of degree.

Forget about targets for a moment because that's simply an REW method of determining filters. It has nothing to do with the subwoofer outside of a measurement situation.

Remember that the voltage waveform that enters the BFD equalizer is perfect. There's no dips or peaks, and if you use no filters, that perfect waveform is fed to the subwoofer amplifier. The dips and peaks are a result of the room getting its hands on the signal.

Consider a situation where you had a perfect subwoofer response, except for a single dip at 50Hz. You decide to introduce a BFD filter to cut all the subwoofer signal down to the bottom of the dip to get a flat room response. Unfortunately the dips bottom was so deep, you had to cut almost all your signal to reach it. You won the war but lost the battle, since there's no voltage coming out of the BFD now except for the 50Hz signal left over that you didn't cut. You cut all the rest of the frequencies away. I can't really turn up my subwoofer amplifer to compensate for this situation or I would clip the amp with the 50Hz signal.....

See the problem.............. raising the entire waveform in REW and cutting everything to get a flat response is the same as I describe above.......

brucek