ART's new ProMIX 3-channel microphone mixer is a quick solution when you need to add three mics to a mixer which only has one available channel. It's a 3-channel mic mixer with switchable 12V phantom power and low-frequency cut on each channel. Output is line level via mono balanced XLR and a headphone/aux 1/4" jack. It's powered by an included AC adaptor or by two 9V internal batteries.