Well, if you don't have a sub, it would be pretty bad if the AVR did not play them as full range speakers.
However, you really want the sub to pick up the bass which means you want them to be categorized as "small".
http://www.stereophile.com/content/psb-stratus-gold-loudspeaker-1997-measurements
While it is not a bookshelf speaker and is pretty linear, it is not full range. Looks like it starts to roll off at 50Hz.
You can manually set them to full band, but then your sub would only be used for LFE and not for music.
Enjoy the new sub!!!