DPA series is a best-selling amplifier of Inter-M realizing the necessary features to public address system. DPA series amplifiers can output higher power even with remarkably lower power consumption than conventional analog amplifiers and can establish an economic and environment-friendly system as it produces less heat and is light in weight. As it has various line-ups of output (from 1 channel to 8 channels), it can provide adequate amplification optimized to all places where public address is needed from small-sized spaces like shops and low-level buildings to large-sized spaces like office buildings and schools where decentralized control is necessary. In addition, as DPA series can play clear and refined sound with over 100 dB of high S/N and below 0.5 % of low THD, it is perfectly fit to high quality of BGM playback which is significant in recent PA system and therefore, it is good to be used in large-sized franchise shops including shopping malls, department stores, and banks.