This paper investigates sound source localization using two spatially separated compact microphone arrays. For a single compact array operating under the far-field assumption, only reliable direction-of-arrival (DOA) information can typically be obtained, making accurate two-dimensional (2D) localization challenging. To address this limitation, a dual-array beam cross-scanning framework is proposed. Within this framework, a frequency-bin-level fusion strategy is developed to jointly integrate spatial responses from the two arrays over a candidate position grid. Specifically, frequency-domain spatial observations are first constructed for each array using a Householder transformation (HT)-based method, which enhances the representation of directional signal components. These observations are then jointly fused at the frequency-bin level to directly form a broadband spatial response on the candidate grid, from which the source position is estimated. Experimental results demonstrate that the proposed method achieves consistently strong performance across various conditions.