Is this possible and is it worth it.? is it technically doable?

 

I think the main difference is the addition of a subwoofer on the 770 watt system. If so, should not be hard to do.

However, letting your hi fi shop add an aftermarket subwoofer and amplifier, together with a little selective modification of what you have now would produce better results.

 

Was in a Range Rover with a similar system and the suv accoustics make a huge difference! It really sounded great in Meredian mode. Maybe radio is good not just adapted too well to small car. It had 2 subs and 850w and was the upgraded system.