Dynamic Micro Speaker DB Unlimited Dynamic Micro Speaker is a flush mount type dynamic rectangular speaker and comes with a sound pressure level of 93dB (at 10cm). The dynamic micro speaker incorporates a resonant frequency of 850Hz and operates at a frequency range of 850Hz to 10,000Hz. This dynamic speaker operates at a maximum power of 1.5W and a temperature range from −30°C to +70°C. DB Unlimited Dynamic Micro Speaker is made of polymer cone material and weighs 1.4g. Typical applications include safety, security, medical, transportation, and consumer devices.