John, i think i misread the instruction manual..
"FULL RANGE sends 20Hz to 20KHz signals to the loudspeaker. LIMITED
sends information from the crossover frequency (see below) to
20KHz to the loudspeaker. The frequencies below the crossover frequency are sent to the subwoofer if present; otherwise, these low frequencies are sent to the full range loudspeakers in the system"
i scanned over the instruction manual, to try and figure out were i got the idea that the subwoofer needed to be "off" to get 20khz-20hz to the L/R output..
