I have the pioneer T 1809 since i put a new battery in it. I have adjusted the radio over and over. It seems like there is a loud button on. But i dont think there is one. Or is it just my ears playing tricks on me.

 

its called ssp on the right side of the unit it has different settings like hear and feel it will make a huge difference when you go through the settings.

 

used the ssp button.. stills sounds different .. just me i guess

 

big **** on the left, turn it counter-clockwise...
lol its the SSP settings