Yeah, I know my ears do, thats why I got it close with RTA and tweaked by ear. My hearing falls off below 30 or so thanks to a system I had some time ago. But even knowing that, 25 hz was RETARDED louder. I still set my stuff up for 20 hz because others can hear it, when I can't at all. But in my check watching a few things, it never saw 20 hz. you said 4dB, 4dB isn't RETARDED louder, it's a louder but not RETARDED louder. And M5 reread page 6, where you even commented and stated he should try for 150dB at 5hz. (I'm not defending the guy, because i don't know him, i'm just stating facts.)