Since your system is 5.1, you don't need the 861v6.

The UHD722 still has the 4x RCA SmartLink outputs, and you can configure them to match up to MD1/MD2 inputs on the 861v4.

1. Trinnov Alt32, Meadowlark Semi-custom 4-way Digital mains, Custom 3-Way Digital center, M6, DSP420, HSU VTF2
2. G68D, DSP6000, DSP5kC, DSP420