I have a 2006 f150 king ranch with the factory radio still in i was wondering if there was anyway to stop it from lowering the sound when i slow down other than replacing it with a aftermarket radio? thanks for the help

 

Push Menu until you see Speed Volume or something that sounds like that - turn it to off/0

 

Here's the text from the owner's manual:
SPEEDVOL (Speed sensitive volume): Radio volume automatically
changes slightly with vehicle speed to compensate for road and wind
noise. Press MENU until SPEEDVOL appears in the display.
Use / / SEEK to adjust the levels. The recommended level
is 1–3. OFF turns the Speed Sensitive Volume off and level 7 is the
maximum setting

 

thanks for the help =)