Thanks a million for the kind words. It took a while but I am glad I did most of it myself.
So, thinking that when funds allow, which might be a while, I will get the Infinity amp to replace the Blaupunkt one. Unsure whether I will then keep the Blaupunkt and go passive with the Focal speakers or use the Infinity Amp to go active with the Focal and power the rear speakers with the Blaupunkt amp. Guess I will cross that bridge when I get there.
Massive thanks for all the info given as I have learnt a lot and know that there is still more reading and learning to do. Love how this sound upgrade project started with me knowing very little with the basic stock components in the car and now I have something that I am quite proud out. It still surprises people when they hear it for the first time and that makes me smile
The infinity amp is overpriced at £350, and the total harmonic distortion at the rated output is 1% thats (bad) brobably due to the cass D output stage - translation = its crap
The much cheaper BOSS amps are 0.01% total harmonic distortion at the rated output (exellent quality) - i looked at scores of amps to find an affordable one (or range of amps) with i very high spec (including superior class AB output stages ) at an affordable pric- this amp/ range of amps blows many much more expensive amps away (in terms of quality)
Im not looking at brand names but at technical specs
You could get 2 boss amps, and this active boss x-over -
for less than 1 overpriced (and inferior) amp - and that would mean you have more left over for another set of focals -
so you could have the seperate active x-over (with fine control of the system) + 2 four chanel amps so the front and rears would be active, 8x (an amp for each woofer + tweeter!) 150w = 1200w so awesome power, headroom and clarity - and a fraction of the price of an equivelant system
PS - yes your sub x-over frequency is low, try 100 to 200hz, see how it sounds, you may need to turn the bass down