we've combined audio products to make it easy to power the audio from lights alive's firefly™ lightning simulators. Theckage includes two rcf hd 12-a active speakers, with 1400 watts of audio each. Then we added a six-channel rcf l-pad mixer, so you can mix the thunder effects with background audio in a second channel, and possibly microphones or other audio in the other audio input channels. Use your imagination. Then, we've included free 20-foot audio cables to connect the mixer with the speakers! Connect your audio source to the mixer, and you're ready to go!