How much sound comes out the back of a speaker?

[Will]

You don't have to tell me Old hand at this crap now Unfortunately theory hardly every concurs with practice of audio/video setups - well certainly not on yachts.

I didn't know those missions were ported - still don't like ported speakers though

Just use egg boxes you'll be fine

Ultimately there's little you can do bar not play the music too loud or point the speakers at the neighbour's wall. And try and keep the speakers away from the wall as the amplification you get from hard surfaces often sounds crap.