My meter shows 18.9 watts
(give or take a smidge) with my 12 amp Astron power supply putting out 13.8 volts
. This guys tests also show 19 watts at 13.8 volts. So i’d check your power supply, or make sure you have the power turned all the way up as it’s set low by default.
Also an external speaker
(needs to have a stereo plug, not mono), or connected to your PC will save your ears. The tiny 1” built in speaker isn’t the greatest for extended listening depending on the band you are on as some bands are noisier than others.