Proper REW settings to get the most accurate low end frequency (vs phase) response.

[Chuck Gerlach]

In REW, what are the proper Frequency Dependent Window settings (and/or other settings) to use to get the most accurate low end (south of 20Hz) frequency response (not concerned about phase)?

 

[dcibel]

Don't window for low frequencies...ie set right window length to something like 1000+ms.