I believe you'll need the Carver subs to go with this amp as the amplifier sends a 30 volt signal to them. I do have a spare set of Carver subs which I'd sell separately.
Do you have the CID (pop up screen) for navigation? If so then the dsp amp will enable customisation via the parametric eq to your taste/ears! If not, you'll need the business cd player with dsp options and then you can choose from a limited range of eq settings.
Personally the dsp set up in the coupe sounds great provided the software or dsp amplifier runs the roadster "filterbankes" (eq parameters). I've been experimenting if different variations of the dsp set up and can even programme dsp amps via INPA/NCS Expert.
Happy for you to come and try the set up before committing or listen to my set up. I'm near Lichfield and available most evenings.