NEW and Improved – While keeping the same look as the A4-8, the A4-8MKII features a 4-channel mixer, independent EFX level control on all 4 channels, EQ controls on two channels , Direct Outs (Chan 1 and 2), Stereo Mix Outputs and a Master 3 Band EQ for the Monitor Outputs. Built-in 11000mAh Lithium Iron Phosphate (LifePO4) Battery with Bluetooth and Aux Input. Powered by 80 Watt Bi-Amp Class-D amplifiers, our 8-inch LF driver promotes stunning bass response, which, combined with A4’s higher efficiency silk-dome tweeter, retains and fully articulates every nuance of your musicality. The resulting clarity and sonic imaging cuts to all genres creating shimmering acoustic and expressive vocal performances. The end result is uncompromising audio quality that preserves artistic intentions and inspires creativity.