Changing my radio set with radio with screen type (E39)

[bimmerholic]

DSP= Digital Sound Processor

Not necessarily you'll have DSP amp if you have DVD/sat-nav in your car. It's a separate unit all together.

 

[hofmeister]

DSP= Digital Sound Processor

Not necessarily you'll have DSP amp if you have DVD/sat-nav in your car. It's a separate unit all together.

how do we tell in the quickest way ?

 

[bmw7833]

how do we tell in the quickest way ?

U should have the 'DSP' button in your MID if your car come with DSP feature. See the top right button in the pic.