Combining acoustic technology and premium materials, our PD Passive Speakers are known for their colossal sound and are designed to suit any surrounding. The integrated amplifier comes with factory presets for easy and optimized performance. The setup makes it easy to save and load new presets. Bluetooth connectivity allows for easier playback and wireless microphones allows for a wider application for announcements. This makes it perfect for clubs, restaurants, gyms or where ever you want to pump a party or create an ambience. What sets this system really apart is the quality of sound. With clear crisp highs and thumping lows you are sure to impress your crowd with the auditory extavaganza , all with the flexibility of an unbeatable price. Plug and play is the key. model IA8502 contains 2x500w atts amp while IA8504 contains 4x500w atts amp where the additional two channel could be used for surround speaker or bridged to output 900w watts to drive a massive subwoofer like sw115 or sw118.