Yeah I thought it was weird too. I use to have a RF 1001bd (2 ohm stable) and ran it 1 ohm all day long with no problem. And this one plays fine at .7ohms at a lower volume, but when I crank it up it will play for about a minute then I goes into protect mode. Though it might be because of lack of voltage, but it stays around 14 volts. I also checked the remote wire voltage and it stays constant at 12.8 volts. I think it depends on the amp and I just got one that can't play below 1 ohm. No big deal, I had already decide to get 2 of those bad boys anyway, for future plans!!!!
Also, this one amp pushes these Qs way better than my old Hifonics Brutus bx1500d did!!! Although that brutus did run at .7 ohms all day long.