When I first started investigating the "EVP" phenomenon, I of course approached the issue skeptically and scientifically. Instead of being overwhelmed by the occurrence, I attempted to see past the occurrence and see what was making it happen. I looked at the possibilities that the communications were transmitted via short wave, AM/FM radio or by CB/HAM communications. I found in one instance that when recording in areas within a 1 mile distance of a AM/FM booster stations emanating thousands of watts into the surrounding environment yielded a bleed over effect on standard recording equipment. This is mainly due to an overpowering frequency within a localized area and scientifically, understandable. Realizing this, I made sure I was recording in areas far from excessive power sources.  I then began to heavily investigate the hardware I was using. The manufacture standard for cassette recorders is 20hz. - 20khz. and likewise with the standard cassette tape. However, most microphones these days are in the higher frequency range ( 50hz. or 100hz. - 100khz. ). For Karaoke, these microphones are great but for capturing "EVP" activity, these high frequency microphones operate on too high of a frequency to capture a great majority of the present "EVP" activity. When this was noted, I began utilizing a spectrum analyzer when reviewing my data. What I found made me even more curious. About 99% of all EVP's occurred within the ( 20hz. - 40hz. ) areas. After thoroughly testing this theory. I began developing high powered low frequency microphones. These microphones look nothing like your average microphone. These microphones are large, the weight of the microphone is between 5 - 8 pounds and are constructed to be mounted on a heavy duty tripods. They are devised to be used with High Wattage amplifiers. I went through many prototypes before I found a design which yielded brilliant results. I am still refining and developing new prototypes which yield a more compact design and weigh far less. This has been accomplished and produced even a better quality recording. The optimum is to use the lowest frequency microphone heads available, usually the (20hz. - 20khz.) is the lowest you can find. I have developed a microphone which is used on my digital recording station which has yielded a frequency rating of (1hz. - 100hz.). The DAT I utilize records sound frequencies as low as (2hz.). For the human voice, these extremely low frequency microphones sound horrible. But yet, we are gathering data which is far below the level of human hearing which is regularly in the area of (50hz.). My friends, if you want to increase the amount of EVP's you gather, start focusing upon the frequency level of your external microphone. With standard equipment, the lowest you might capture is (20hz.). In the future, I may make the plans for the low frequency microphone available to the public.