Source will be computer using Equalizer APO 1.3, SMSL A300 amplifier/dac powering two SVS Bookshelf speakers.
SMSL A300 Subout > single RCA to XLR for mono input > CVR Audio D-802 Power amplifier > Speakon cables > two Marty-Cubes with Dayton Ultimax 18" on each L/R channel (1300rms x 2 @ 4ohm)...