i can't speak about the lfm but i can about my monitor audio asw-210(no longer powered,now passive(powered by marantz ma-500)). it's 2 10's,1 down,1 forward,2 3" ports(forward).i plugged one(where is soundhound anyway) and oh baby!this thing gets down and dirty.wicked like!BUT, running a 15hz-20hz slow sweep,MAJOR PORT NOISE.but how often do you get those freqencies in program material?RARELY if at all.to get that amount of noise i'm pushing 120+db@3 feet.i can't hear port noise from my listening position.
click on 'blade' below and there's a pic.
if you do try it,make sure the plug fits or the noise could be nasty.