the enclosures 200 are shown disposed in a downhole tool 100 equipped with stabilizer blades 320 with this embodiment the transducers 210 within the enclosures 200 can be maintained in direct contact with the borehole wall for more accurate measurements those skilled in the art will appreciate that the enclosures 200 of the invention can be disposed on downhole tools in many ways depending on the desired measurements and mode of tool conveyance within a borehole for example an enclosure 200 can be affixed to casing tubulars inside or outside using conventional fasteners or clamping means and linked by cable s for power communication for long term monitoring applications fig7 shows a general schematic layout of an electronics module 32 that can be implemented in an electronic board 230 of the enclosures of the invention the module 32 includes a preamplifier stage 101 a filter stage 102 an analog digital converter adc stage 104 and a power amplifier stage 106 the module 32 is shown linked to an n to 1 multiplexer mux unit 44 adapted to funnel u201c n u201d signals to one channel for output through lead 42 a switch 108 linked to the transducer element 210 toggles between position 1 and position 2 in position 1 the transducer 210 is activated by the power amplifier stage 106 and the transducer is implemented as a transmitter with the switch 108 in position 2 the preamplifier stage 101 receives the analog acoustic energy signal detected by the element 210 and it is processed through the module.