Anyone who knows and has used Bose speakers is aware that this piece is essential for their proper operation. I particularly like this newer version since it allows for XLR input and output. The other versions only have XLR as an input. I find this model has less "noise" in the overall sound system. I purchased this item for use in a large school gymnasium. Our school seems well pleased with the Bose system. We use 6 Bose 802 speakers, 2 large subwoofers and of course, the Bose system controller. We are very happy with this purchase.