The powered mixer is normally stored in the rear of one of the speakers. The STAGEPAS™ powered mixer can be detached (the only tool you need is a coin) for convenient operation. The power amplifier is a class-D* type that delivers a solid 150 watts + 150 watts from a remarkably compact unit. The mixer has a total of eight input channels: four mono microphone/line inputs and two stereo line inputs. In addition to speaker outputs for the supplied speakers, the STAGEPAS™ mixer has line outputs that can be used to connect additional powered speakers for monitoring, or to send the mixer's output to a recording device. * Class-D power amplifiers provide high-efficiency amplification with low power consumption and minimal heat generation, allowing the amplifier to be built into a smaller, lighter, and cooler package.