Coprime linear microphone arrays consist of subarrays, each with inter-element spacing of half the wavelength observed times an integer factor. These two factors, M and N, corresponding to each subarray, are coprime, which ensures that their sensitivity completely overlaps only in the direction of the main beam. This implies a single observable wavelength, thus frequency; however, the grating ... [Show full abstract] lobe-mitigating effect can also be achieved for broadband sources [D. Bush, and N. Xiang, J. Acoust. Soc. Am., 138, 447-456 (2015)]. A modified Laplacian function provides a phenomenological model for broadband noise array responses, but real-world signals vary in spectral content making it prudent to develop a model which incorporates finer-resolution frequency dependence. This work also explores spatial filtering/source separation techniques for coprime linear microphone arrays. Multichannel experimental impulse response measurements with differing angles of incidence are convolved with independent speech signals. Subsequently, coprime beamforming is applied to the results in order to directionally filter, thus separating the source signals.