I take a somewhat literal approach to the term - "full range" would in theory mean a speaker with a -3dB point at or below 20Hz (the lower threshold for average human hearing) that also is capable of reproducing up to 20,000Hz (the upper limit of our hearing). My mains are tower speakers with a -3dB point of 30Hz and a -2dB point of 42Hz; I do not consider them full range and in fact have them crossed over currently at 60Hz.