arXiv:2610.21803v1 Announce Type: new Abstract: Speech enhancement systems are commonly trained using randomly sampled mini-batches, which may contain limited diversity in intrinsic acoustic characteristics of the clean speech signals. Motivated by previous findings linking clean speech characteristics to enhancement performance, we propose a feature-stratified mini-batch sampling strategy that divides training examples into quantiles according to a clean-speech characteristic and enforces equal representation within each mini-batch. Experiments across two large-scale English and Spanish speech datasets and a smaller dataset containing neurotypical and pathological speech demonstrate improvements over standard random mini-batch sampling across multiple objective enhancement metrics. Ablation studies demonstrate that the gains are robust across training runs, while their magnitude depends on the acoustic characteristic used for stratification. The proposed strategy requires no modification to the enhancement model or training objective, providing a simple and complementary approach to speech enhancement training.