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This paper proposes a methodology for studying the spatial resolution of a collection of first-order and high-order ambisonic microphones when employed as a capturing tool of Spatial Room Impulse Responses (SRIRs) for virtual acoustics applications. In this study, the spatial resolution is defined as the maximum number of mono statistically independent impulse responses that can be extracted through beamforming technique and used in multichannel convolution reverbs. The correlation of the responses is assessed as a function of the beam angle and frequency bands, adapted to the frequency response of the loudspeakers in use, with the aim to be used in recording studios equipped with virtual acoustics systems that operate in the creation of the spatial impression of reverberation of real environments. The study examines the differences introduced by the physical characteristics of the microphones, the normalization methodologies of the spherical harmonics, and the number of spherical harmonics introduced in the encoding (ambisonic order). Preliminary results show that the correlation is inversely proportional to frequency as a function of wavelength.