You should have a HI and a LOW setting.
But the Low is like 90% of the high fan speed. So its like HI 1 and HI 2 settings.
But if your having to yell to talk to someone right next to you perhaps something is wrong with your. Go do your local RV dealer ship and have them fire up one on the lot simular to yours and see what it sounds like. Or if you have a neighbor with an RV ask him to crank it up.
Check behind your thermostat for a loose wire for your low setting. Mine was loose and did not work at first.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor