It would depend on what system is fitted
You have 1 of 2 ways(in my mind). You can unscrew every screw, or(the fun way) smash it!
changing the amplitude of the soundwaves
Stereo system
I assume you mean Hummer. No, a Hummer is not a Jeep. The Hummer or Humvee replaced the Jeep in the U.S. Military.
Hummer.
Yes. Please lower the volume on your stereo.
auto volume
read the manual.
William Hummer's birth name is William Bruce Hummer.
The defintion of an RC HUMMER H2 is a toy radio controlled Hummer H2. A Hummer H2 is a large SUV resembling the Hummer tanks that they use in the army. It is actually the 2nd Hummer that was manufactured and although the Hummer H2 is smaller than the first one it is still very large.
For an iPod Touch, go into setting, then music. Turn volume limit on and select the desired maximum volume. For classic iPod, go into settings, and there's volume limit. I've never had any other type of iPod, but I'd assume it would always be under setting somewhere.
Take the stereo out and check the wiring at the back harness. Make sure it is clean and tight.