COMPARISION: Drivers BG55 and BG55/Chifon
The Listening Room Measurements

Baffle boards only - 0.75" thick, 17.75" width
Unsmoothed responses

Microphone at 2 meters distance and a height of 1 meter.
MLS: 32 averages, 432/4096 point FFT, Half-Bingham window.
NO octave smoothing - Amplitude Axis @ 6dB per division.
Nominal 'ZERO' dB line @ -6dB on plot.
Careful inspection of 'Chifon' plot shows overall reduction in variance.

The Listening Room Measurements - Comparison: BG54 & BG54-Chifon.
The Listening Room Measurements - Baffle: Basic.
The Listening Room Measurements - Two-Sided Baffles - Table of Contents.
Acoustic Line Source Research - Table of Contents.