A class D amplifier one is best. A good example is the Sony dsx-gs80.
Most car stereo's are class AB and 50w RMS
The advantages in a camper of Class D compared to a normal class AB are:
- They are about 90 -95% power efficient compared to 60- 70% - So you use around 30% less battery power for the same volume.
- Normal stereos need 13.8V and are designed to operate when the alternator is charging. Many will have noticed that their stereos in the camper have a lot of distortion, especially as the battery charge lowers. Class D stereos can go down to about 10V with little more distortion. Normal ones hate anything below about 12.8V
-Normal stereos are limited to 50W RMS per channel, a class D can go higher if you select the right one.
- They run cooler.
I swapped a few years ago. It is a world of difference, especially as you have to turn the volume up a little if you are listening to music outside the van.