Hi, I'm using a hydrophone to detect frequency signals (or more precisely pressure) in water. It involves using a hydrophone to detect the peak to peak voltage of the sinusoidal signal. BUT I forgot to change the high pass - low pass settings! It was left to detect between 250kHz (high pass) and 1MHz (low pass), and I have been analysing frequencies at below 250 kHz. I have been using the detected peak to peak voltage value of the sin wave, not measuring it's frequency. I got readings that made sense, but now I'm worried that the filter being applied incorrectly will influence results. Any ideas? will a high - low pass filter effect the detected peak to peak values? Thanks for any advise!