In my observation, and I agree with you… You have to hold this thing down further on your ear than other phones. In looking at the iPhone in my hand… The speaker is about 1 cm down from the top of the phone. In looking at the essential, the earpiece is right on the top ridge.
I thought I had a defect, until I realized that the phone speaker is extremely sensitive to positioning. It must have some sort of directional amplification to deal with it's tiny size. If you move your head around and get used to the best position, you'll find it's quite loud.