With other cheaper competitive boards, their exists a Center/Mono matrix that is often used as a sub-send to the output/amps. In addition, the ability exists on other boards on the Mains fader the ability to send matricies to the Mains fader to have everything tied to ONE fader for overall house gain control – thus controlling your subs and mains output on one fader. SQ6 does not have this option.
I’ve already spoken with A&H about this option and this is something they are looking to implement.