Hello all please help with the following

I am getting the following headunit Alpine CDA 9887R, and having some speakers fitted at the same time. Im having some infinitys fitted that are £60, but have since seen these which I think may be better? Alpine SPR 17s.

In your experience which make is usually better infinity or alpine?

Also Which size speakers are in the rear door cards? And is it worth changing those aswell as Im thinking the new headunit will over power the originals?

Please help as im having these fitted soon, and might want to cancel the infinitys and go all Alpine.

Thanks in advance

 

http://caraudiosecurity.com/shop/pro...s_id/5769.html This is the link to the speakers

 

If you have a newage, rear speakers are 4 inch.

Which Infinity are you going for? I have 6020cs which I think are good, those Alpine's will probably be fine too as long as they are not too beep.

Let me know what you think of that headunit - I've just ordered one.