So I have recently upgrade from my jad series 800.4 nvx amp (great amp) to the wolfram a/b 125.4 amp. I was trying to match everything as best I could to the tuning I had done on the nvx. Crossover points n such. I have matched the gains the same with both amps using the digital multimeter method and formula (voltage = square root of desired rms times ohms). Anyways this new amp is different from the previous in tuning crossover frequencies. It has bandpass settings and just one dial for each channel and hpf and lpf selector. To my understanding. I have depressed the x10 hpf filter and turned dial to about 80hertz for each channel. Does that mean I am playing 80 hertz and up? Or above 80hertz -8000hertz? So lost with this bandpass filter for each channel. Been researching and can't find solid answers. The nvx was way louder than this wolfram amp with gains being the same. I must be doing something wrong with this bandpass dial.