I asked in another thread already but my budget for all audio including receiver that is wifi capable and has ability to stream iPod music via AirPlay is 2500. 5.1 setup. I have 14g wire already installed. I suspect that much of design is simply matter of opinion, like local code requirements, there are some things that are required and needed, but how its done beyond that is just preference. To me, a single 15" sub seems a bit big. 2 - 4 of those sounds like buying a tank to go bird hunting. I am not an 'audiophile', I just want a decent, solid setup. Now, thats what I told my installers so...maybe thats what they are focusing on.