The Krohn-Hite 39000 Hydrophone Analog Signal Conditioning/Filter System provides up to 210 channels of fully programmable hydrophone signal conditioning. The 39000 15-slot rugged mainframe has a variety of high performance filter/amplifier plug-in cards to choose from with characteristics such as low-pass and band-pass functions, as well as, three traditional filter response types of Butterworth, Bessel and Elliptic. The 39000 System is ideal for conditioning low-level voltage signal inputs in front of high-resolution data acquisition systems.