Further to my other post about problems (aren't I eager to cause more problems before fixing my others

In the Service Menu I noticed that there is a parmater listed for the BOSE amplifier. Now, I don't have one of those so it's empty. But it got me thinking... does this imply NC3 is looking for the amplifier?
I've been keen to improve the audio in the car... I just also don't really want to make changes too far out of line with the car's original specification.
Can I just plug things in and it'll work? Do Nissan provide any retrofit workshop guides? Anybody got any links to other people that have done/attempted/investigated this? I've had a bit of a search very little results found.