In this paper, the direction of arrival (DOA) angle estimation of signals impinging on 3- D array of sensors in cubical arrangement is studied. The results thus obtainedwere compared with the direction of arrivals obtained with a combination of two uniform square arrays which were considered in parallel to form a structure as cube. MUSIC algorithm (Multiple Signal Classification) was used to estimate the directions of arrival (DOA) of the signals .Also in this paper cubical array geometry for low signal to noise ratio was tested and the results compared were with that of the two parallel square arrays .Experimental results demonstrate that the cubical geometry has better detection capability as compared to two 2-D square arrays with the same or even a higher SNR.