Can you explain the difference between the Movie/Music setting on the DD sub.
Is the Movie setting basicaly let's the servo produce a couple of extra db spl for a higher distortion compare to the very low distortion in the Music setting, or is it more like an adjustably Q controll like on the Linn or Monitor Audio FPB212 sub?
I am also wondering how much more max spl in the movie mode compare to the music?
I'll take this one if it's okay. TO understand the movie/music setting, first let me explain the servo system. It is based on an accelerometer that senses cone motion and reports it back to the digital controller where it is compared to the input signal and the cone motion corrected as needed. This happens between 6,000 and 15,800 times per second. The more it happens, the tigher the cone motion and the lower the distortion. Distortion is directly related to how loud the woofer plays, as distortion by-products add to the total output of the woofer.
The theater/music setting controls the servo. The theatrical setting (setting 1), causes the cone to be corrected at 6,000 times per second. The music setting (setting 8) causes the full 15,800 times per second correction. The settings in between control the servo in between accordingly. As a reference, HGS corrected at around 3,500 times per second, so even at the lowest setting, the servo is still doing quite a bit of cone correction.
So, action adventure will play louder since there is more distortion, but how much louder is heavily dependant on the frequency of the source material. For example, 60 Hz will play louder since it is closer to resonance, and there may be more output at 120 Hz (the second harmonic distortion product of 60 Hz). There may actually be a bit less infrasonic playback, since the servo ensures flat response down to 15 Hz and below - some of this effect is lost when turning down the servo loop gain.
Overall, look for a couple dB louder for action adventure, and look for the lowest dostortion at setting 8 (Jazz/Classical out of the box).
Hope this helps,