Powerwerks PW4EX is a 4 Channel MIC/LINE mixer with a MONO output. The PW4EX Model draws on decades of electronic design and manufacturing experience at Powerwerks. This model was built from the ground up to offer useful features, high signal-to-noise ratio, and reliable performance. Powerwerks PW4EX is a 4 Channel MIC/LINE mixer with a MONO output that gives you more channels with Volume, Bass and Treble EQ controls to make any system expand. Use POWERLINK for blending in even more instruments, microphones and program music from other POWERLINK equipped models. The PW4EX works as a standalone mixer too. Use the MAIN XLR or ¼” OUT to send a “sub mix” to any powered speaker or input of another mixer. (4 drum mics for example). The PW4EX gives you the extra channels you need for a perfect mix.