Two perforated acoustic panels can look identical on a quotation sheet yet quote 35–150% apart once thickness, core material and finish are unpacked. The spread is rarely pure margin: it hides in perforation geometry, backing non-woven fabric, core density, panel gauge, lamination method and edge closure. This module disassembles the cost stack for overseas procurement engineers, acoustic design firms, gymnasium and plant-retrofit GCs, then reassembles it into a manufacturing workflow for audit-grade perforated sound absorbing panels. SAMZOON, a Foshan source manufacturer, anchors the walkthrough with free pre-bid coupons, custom perforation layouts and South China acoustic project QC.