What kind of hydrophone are you using --- it seems to be flatter on my SA.... It sure be nice to get the BW up to 8.5 kHz like Lime Kiln --- then I could see the Orca call pre-cursor at 4.8 to 5.5 kHz... I see calls (on my SA) way before I hear them.... Good Stereo Robo ---- Sent from my iPhone