knicknack

hey guys, new to this site so be nice! Just looking at getting a more professional rig as the festival dates are building for next year, and i've settled on getting me some markbass gear, which i think will be a LMK and a 104 of some kind. I was just wondering what the key differences are between the HR and HF models, i really am a newbie to the world of non combo amplification! any help much appreciated! Paddy