Selecting stereo, parallel, or bridge mode, Setting low frequency filters, Low frequency filter – QSC Audio ISA 500Ti User Manual
Page 5: Isa 280/450/750/1350, Isa 300ti/ 500ti/800ti, Ti low frequency filter, Switch 2 controls ch1, Switch 9 controls ch2, Switches 2 and 9 select 50hz or 75 hz, En selecting stereo, parallel, or bridge mode
