I read an article in Sound on Sound, where the writer recommends looking at how much the woofer moves in order to estimate the low bass which you would otherwise not hear. Here's what he says: "Anyone listening at home with a system that includes a subwoofer will often come across commercial recordings with all manner of strange problems in the bottom end. Also, the level of very low bass varies tremendously between recordings. The reason for this will be that the mix and/or mastering engineers simply couldn't hear that low in the studios they used. I also find that there are great benefits in being able to see the woofer cones in the mix room. This is one of the reasons I do not recommend using speaker grilles -- try playing Steely Dan's Two Against Nature while watching your monitors to see what I mean!" from: (http://www.soundonsound.com/sos/May03/articles/studioinstal4.asp) Is this really a valid mixing technique? Usually when you hear too much bass, it corresponds to the woofer moving way too much (obviously), and when the woofer moves too much, you hear too much bass. Here's what I don't understand: Is it possible for the bass to sound good, but for the woofer to move way too much? The only way I can see this happening is if there's a boosted 20-40 Hz in there for some reason, and you don't hear it, even though it's moving your speaker. But nearfield monitors don't usually go down to 20 Hz! A long time ago I was using some cheap M-Audio monitors. Their bottom end started around 60 Hz, but when I put a 20Hz sine wave through them, I could see large and slow movements in the woofer. Does this mean that every speaker DOES go down to 20Hz, or even lower, but we just don't hear it because of the speaker's design, and our natural hearing limitations?