haʊˈɛvɚ, spˈiːsiːz ɪnðə dʒˈɛnəs bɹˈækɪhˌɪpəpˌɑːməs ɹᵻstɹˈɪkt ðə lˈoʊfɹˈiːkwənsi spˈɛktɹəm ʌv ðɛɹ ᵻlˈɛktɹɪk fˈiːld klˈoʊs tə ðɛɹ bˈɑːdiz, ɐlˈaʊɪŋ hˈaɪɚ fɹˈiːkwənsiz tə spɹˈɛd fˈɜːðɚ; ðɪs mˌeɪks ɪt mˈoːɹ dˈɪfɪkəlt fɔːɹ pɹˈɛdəɾɚz tə dɪtˈɛkt ðˌɛm.
However, species in the genus Brachyhypopomus restrict the low-frequency spectrum of their electric field close to their bodies, allowing higher frequencies to spread further; this makes it more difficult for predators to detect them.