Quote:
Ilkka wrote:
 1. At the moment I'm not using any HP filter. During the GP session I used a 20 Hz 2nd order BW high pass filter (the lowest the DCX2496 allows). But I added a low-Q boost at 20 Hz so it became an effective ~16 Hz filter. I didn't bottom out the active driver or the PRs (well you can't really bottom out them).
2. I haven't yet tried those scenes with this sub. I will try them and report back. Though I'm not sure if I'm able to push this sub up to its limits. Remember that I live in an apartment. 
3. My room is really small, only around 1500 cu ft and open (regular doorway) to ~2500 cu ft.
Here's the FOTP scene you mention. I doubt the <15 Hz material is strong enough to make the active driver bottom out. If it bottoms out, it is caused by the 25-30 Hz material instead. Also the WOTW chapter5 doesn't have that much strong sub-15 Hz material. All the really loud stuff is higher.  |
Thanks for this info, Ilkka.
I recall the scene that made me move the HP filter higher. It was the "Exploding THX ball before the intro in Star Wars:Phantom Menace". A waterfall chart like what you did for the FOTP scene, on this one would be great! Can you?
This scene caused one of the subs to bottom out. It was not a hard bottom thankfully and the driver survived. I noticed a couple of things was not set correctly/as desired. First, the right sub (I have two), had the HP filter in the CE4K set to 30Hz (negligence on my part). Second, the pre-amp was set to post-process to Dolby Pro-logic II, since I have 7.1, it shoudl have been Thx Ultra2 on the AVM-20. Also, the HP filter on the Rane was set to 16Hz.
As I recall, the left sub bottomed out. I was playing at MV0 and the subs were calibrated +6dB hot.
Immedietly thereafter, I fixed the 2 issues (bypassed the filter on the CE4K and set the Anthem pre to do the correct post processing, Thx Ultra2) and then I moved up the PE-17 up a notch to 20Hz.
Though the post processing was not the desired one and though the second sub had it's HP filter set to 30Hz, the bottom out made me very uncomfortable with the 16Hz filter. Ever since recalibration. I have yet to bottom out the subs.
Last night I video taped the cone and
PR excursion for the FOTP scene. It does not look like neither the driver nor the
PR is nearing peak. I will try to post the video, this weekend.