Dynamic Speaker Management - Ready Micro Speaker PUI Audio Dynamic Speaker Management (DSM) - Ready Micro Speaker offers a 0.65 to 20kHz frequency range, a 1.2W maximum input rating, and a 6Ω ±15% impedance. This DSM Speaker is water- and dust-proof with an IP67 rating and features a high fidelity sound in a small plug-and-play package. PUI Audio DSM-Ready Micro Speaker operates in the -20°C to +70°C temperature range.