This is using a signal generator and my qsc rmx850 with a single and a set (specified below) of F-Mod 70hz lpf's. Here's a new one with only one in place: 30hz = 4.1v 40hz = 3.6v 60hz = 4.2v 70hz = 3.9v 140hz = 2.2v 240hz = 1.1v Not changing anything but the freq. Gain is WAY down on my qsc. Once again, that was one fmod in place. here is with both in place: 30hz = 1.8v 40hz = 1.6v 60hz = 1.4v 70hz = 1.1v 140hz = 0.3v 240hz = 0.0v Turned the gain up and ran again with both in place: 30hz = 4.4v 40hz = 3.6v 60hz = 3.1v 70hz = 2.6v 140hz = 0.8v 240hz = 0.2v I'm not good with the whole figureing out the slope thing, I'll let you guys do that. They work fine for me, I'm happy even if they are only 6db/oct each and not 12db... I can live with a 12-13db/oct lpf.