Excellent (IMHO world class) midrange, decent treble (relaxed and little rolled off, but fast and very clean with no grit or spit), and limited bass (rolls off pretty quickly below 90 hz or so). They work great blended with a sub, and also nice on the desktop. They image very well with good depth, width and 3 dimensionality when set up on stands and out away from walls. Efficiency seems pretty high for a compact driver in a tiny box... I'd guess 86 or 87 db output for 1 watt in. All in all, if I wasn't moving and losing my second (bedroom) system and office desktop I'd certainly be keeping them.