God it sounds like a nightmare! I thought a separate amp could just be connected to the head unit and take over all the work it should be doing. I know about hifi set ups but nothing at all about car radio's as you can tell!
well, very basically that's what it does. Reality is you need to find space for the amp, get power to the amp, ground the amp, get signal to amp, get signal back to speakers. Someone could correct me on this, but as far as I know, installing an amp and installing a head unit would both require tearing down a good amount of the center console & dash to get to the back of the head unit.
I've heard replacing the head unit is a major pain and don't wanna do this if I don't have to. But, if after changing speakers AND installing an amp I don't hear a major difference in sound quality I won't be happy so I'm glad you've told me this before I started buying the kit!
Definitely do more research before you buy any kit, particularly when it comes to amps. Don't be misled by some of the cheaper amps power ratings. You're better off getting something with less watts but better quality power, than something with big watt ratings and poor quality power.
Like I mentioned above, 50 watts RMS from a quality amp would make most mid range speakers sing.
So how much is your set up gonna set you back then? You doing it yourself or are you gonna get a shop to sort you out??
\My whole system is going to include a new pioner double din head unit, a double din kit from impulse, infinity kappas all around a Phoenix Gold Octane 4*75 watt and a self powered 8 inch pioneer sub for a bit of low end fill - all together maybe €1500 worth. I will unfortunately be putting it all in myself & I'm not looking forward to it.
Just to add, I'm not an expert..just have had a little experience with this sort of thing over the years..