Can't see too much wrong either, don't understand the mention about Elton John, unless I have missed something he is a massive bender and the wheel looks ok.... I would say it is more like David Walliams, you may just think it's bent....
The HU should have an amp live out basically it tells the amp to wake up when the unit powers on, as for low signal, cheapest/easiest way is to strip the RCA connectors, search for busters thread on how to do that
Whole system is crap, cheapest is to do the soldering hack but best option is to change head unit, speakers etc but not a cheap option, all depends what you want...
Do the hack first as its pennies then see if your happy
A Zed isn't the greatest for mega bass or SQ due to the roadhouse and poor build, lots of rattles & buzzes... just crank it up and forget about getting it perfect
At least the stupid 3D TV bubble seems to have burst my Samsung will be 4 years old in January, 47" and cost me £800 back then, the same model with 3D was double the price