arXiv:2604.19602v2 Announce Type: replace Abstract: A notable difference between the ordinary and Hadamard products is that the Hadamard product of two singular positive semidefinite matrices can be nonsingular. We present an eigenvalue lower bound for a Hadamard product that depends on a leading spectral projection of freely selected rank for one factor, and the smallest eigenvalues of certain principal submatrices of the other factor. Maximizing over the selected rank gives a stronger estimate; an effective-condition-number bound follows as a simpler consequence. We establish sharpness for prescribed ranks and effective condition numbers and examine limiting examples that delineate the bounds' usefulness. We give numerical examples and discuss applications in array signal processing and matrix time series analysis.