The archaeoacoustic properties of an ancient hypogeum in Cividale del Friuli (North Italy) were studied. A series of experiments took place over a one year period to establish its acoustical resonant properties. A number of male and female singers were used and a resonance of 94Hz and 103Hz was discovered in two of the hypogeum’s six chambers. The best frequency response was obtained when male singers were positioned inside a ‘sound node’ that was discovered in both chambers. The term "node" refers to the point in the interior space of the chamber where the greatest acoustic resonance effect is achieved. Later the effects of a frame drum were studied in one of the two chambers. Although it had an average frequency response of 55Hz, the drum was able to activate the chambers resonance of 103Hz from its harmonics. The research demonstrated the male voice was more successful in stimulating the resonance than a female voice, as the required resonant frequencies commonly fall within the male vocal range. This study demonstrates that archaeoacoustics is an interesting emerging field capable of analyzing ancient sites, utilizing different study parameters to those usually used in archaeology. Research in this field is re-discovering lost technology that operates on the human emotional sphere.