change the output level on my BFD? I don't see how that could be. But unless I've changed something and don't remember doing it, my BFD output levels are definitely up from where I remember seeing them. I *never* got the BFD clip light to illuminate before with ref level MV setting. But after the driver upgrade, using the same source (Titan AE), I am getting significant illumination of my clip output LEDs... this at 5 to 10 under ref, too. I have even seen the Samson amp very slightly light up the clip LED since the upgrade, but I had the sub about 5 dB hotter than the calibrated level. Maybe I just didn't have things set like I did when I last set up the BFD. But is it possible that the new driver takes less power and allows the output level on the BFD to be higher that originally set? I figure I'm just not remembering correctly. Oh.. one thing I remember changing in the last few days before the upgrade.. I disabled the Bass Peak Level Limiter after reading Ron's post about bass compression. Could that have been a factor? One thing's for sure, this new driver can really sing! Although I've lusted after a 2nd CS, this has moved me much closer to a dual CS setup sound than I would have thought possible (if I remember how those dual CSes sounded a few weeks ago) Looks like I better recalibrate after the driver upgrade.