This paper presents an improved method for characterizing integrated microphone arrays for Device-Related Transfer Function (DRTF) synthesis. A probe-array extension of the IMPro technique is introduced to measure all device microphones simultaneously, eliminating unknown timing offsets that arise in asynchronous deviceprobe recordings. A custom four-element probe array and modular test jig were developed to evaluate relative inter-channel propagation delay (RIPD) accuracy across varied microphone-port geometries. Hybrid free-field DRTFs were synthesized by combining IMPro data with Boundary Element Method (BEM) acoustic scattering
simulations, demonstrating that the probe-array measurements capture small delay variations essential for precise spatial-audio modeling. The extended IMPro method offers a practical, scalable alternative to anechoic-chamber measurements for modern multi-microphone devices.
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