[Chrisbee]

I'm using a 120/60 +16dB boost @ 20Hz with my IB using the 1124P. Several other filters at 10Hz steps 30Hz, 40Hz etc bring the inevitable hump above 20Hz back down to the target curve leaving the sub-20Hz boost almost untouched. I probably have an easy 100+dB (uncorrected RS SPL meter) capability at 10Hz if I was brave enough to try.

I see no excess cone movement suggestive of overdriving my AE IB15 drivers on any programme material tried so far. I take no responsibility for others destroying their subs (IB or not) in trying this extreme BFD filter setting. My IB has always needed to be driven hard to get any cone movement at all despite the very high SPLs I am getting.

Before and after graphs appear in my sig using the latest soft-look RS SPL meter and the REW correction file.