arXiv:2611.06345v1 Announce Type: new Abstract: This document describes the measurement setup, signal processing, data organization, and MATLAB file format of a database of acoustic responses measured on a Knowles Electronics Manikin for Acoustic Research (KEMAR) using the Hearpiece, a multi-microphone, multi-driver in-ear research device. The data include binaural room impulse responses (BRIRs) and Hearpiece driver responses, together with center-microphone room impulse responses and a loopback impulse response of the playback and recording system. The BRIRs cover two Hearpiece configurations, three room conditions, three independent insertions per configuration, and 24 horizontal source directions. The database supports reproducible research on binaural and hearing-device signal processing, with potential applications in speech enhancement, spatial filtering and source separation, dereverberation, active noise and occlusion control, and acoustic feedback cancellation. The database, MATLAB loading script, and technical documentation are publicly available at https://doi.org/10.5281/zenodo.23667308.