HPS50 Audio Calculation

I was wondering why the Velleman HPS50 only has audio power calculation (rms and peak) down to 2Ω. Would it be alright if I do a run with a 1Ω load on the 2Ω setting and double the result shown on the device?

Thank you in advance.

It should not be a problem to recalculate the power when measuring on a diifferent impedance setting.