Rockford Fosgate - #TBT to the 80's and 90's when tri-mode was the rage for simple systems. A 2-channel amp could run mids/highs in stereo with a bridged subwoofer (or subwoofers) in
Subwoofer Pros Release Ultra Compact Studio Sub 10 with Response Down to 16Hz | audioXpress
Large vs Small Subwoofers: Exploring LFE, Main, Double Bass, and More | Subwoofer 101"
FILA-118S | Mode Audio Series 18" 2400W Line Array Subwoofer, Black – Sound Town