I have mackie 624`s and a mackie sub , works excellent for me, but took a while to set up properly as there are so many options on my sub and my speakers , basically if its set up right its a good thing . However it kinda depends on the size of your monitors , some larger monitoring speakers get right down there anyway sub or not ,however these are expensive. I suspect that the samsons dont get right down there and so a sub would make sense.