If you go into setting acoustic there are a range of standard options, some are quieter than others.I find the volume steps to large for normal listening. Volume on 2 to quiet, and 3 is too loud, when driving slowly and you just want some background music. Is there any way to turn down the overal volume of the speakers to have more control over the volume? I have a trialmaster btw.
You could alternatively scroll down and select equaliser, you can then turn up or down all the frequency sliders to change the volume output across the board.