Hmm...what it does is subtle. Nice and small though. With my old mixer a mute might be handy but the new mackie mixer has those on each channel plus a master mute.
Tested using Yamaha DXR12 tops, flat (not foh, no contour, no crossover)
Mono - yep, nice to have that.
Compressor - increased volume would be my observation. Can see this being useful.
Feedback suppression..with a corded sennheiser I don't notice any difference, but it's not feedback prone.
EQ...it says it has one..comparing settings I can hear a difference - speech vs rock for instance. Not impressed at this point. Subtle I suppose.
Sub Synth..nothing. Well, up to 50 (out of 99) I hear nothing different. I will have to hook up my sub and hear what, if any difference, there is.
I REALLY wish companies would use the same connectors...input is XLR or 1/4" (female). Output is XLR (male) only. Why do I care? Well, my old mixer was 1/4" out only so I got 1/4 to XLR male speaker (aka long) cables. I don't have long XLR-XLR cords. The yamaha's can take 1/4" in but the gender on the other end isn't right for the GoRack. Easy to cobble something together for a test..but I need gender-benders or new cables.
I will test it with my old passive setup as I'll be using it the end of the month and it may make a difference there - no speaker-specific amps, cheaper speakers, older design of everything.
I hate buying cords..should get some black xlr-xlr for my sub(s)...