F18 is designed to be compatible with other sealed subwoofers from our product lines. With 12hz and high damping setting, it is frequency response is very similar to that of F15HP/E15HP. In the following are the plots for both frequency response and phase response. Phase alignment is very important when integrating multiple subs. It is our objective that all of our sealed subwoofer models have similar low end frequency response and phase response.

Fig 1.0 - F18 Frequency response chart with line-in 12hz high damping

Fig 1.1 - F18 Frequency and phase response chart with line-in 12hz high damping

The high (low) damping setting has the most gradual (steep) roll-off. For movies, we recommend mid damping or low damping.

Fig 1.2 - Comparison of F18 Frequency response of all 3 different damping settings at12hz

F18 also has a rumble filter with -6db @10hz. This is suitable for playing the intro scene in movie Edge of Tomorrow. Fig 1.3 shows the frequency response and phase shift of this rumble filter. Rumble filter should be turn on for maximum SPL playback at all times.

Fig 1.3 - F18 Frequency response of the selectable rumble filter

Integration

One important aspect of getting a correct integration is phase alignment. We have written a guide on how to achieve a phase aligned subwoofer. More