[jmcomp124]

WillyD wrote:

http://www.avsforum.com/avs-vb/showp...&postcount=216

I don't recall you ever having a problem with the SSF set to 15Hz. I just thought you were afraid of potential problems at that setting so you set it higher.

Thanks for the link Willy. I haven't been frequenting those forums as much as I used to, and I am back here only to see Ilkka's mesurements. You are right, I didn't post about problems with a setting lower than 20Hz. Sometime during the long experimentation process, I managed to bottom out one of the subs again when I pushed to +6dB beyond reference. If it is just reference levels it was fine. WIth the amount of power that the CE4000s deliver, I could keep pushing and the sub gave up before the amp.
At one time while measuring the THX intro scene, it was about +6dB beyond reference and there was a mild bottom out and thankfully that did not damage anything. So I switched back to 20Hz and since, I have not experienced any bottoming out. My fear of the potential problem was true though. Post #310 in my thread on avs talks about this 20Hz setting when I registered 119dB at LP. But the fact is, it did bottom out when the HP filter was set to 16Hz for the THX exploding ball scene. I hope this clears up some confusion. I had revisited WinISD models at that time and 16Hz 2nd order BW did show some warning signs with the peak excursion of the main driver. Blame it on the crown , it doesn't stop delivering .