Speaker Locations - 3d '04 T3

[VSP]

Hello all,

Bought myself a corolla over the weekend, and my only complaint so far is the standard head unit / speaker combination can sound a little grainy at decent volumes.

I'm going to replace the Speakers myself (I have fitted a few parts in my time), but I can't seem to find any information about where the Speakers are.

Any information would be appreciated!

Also, any recommendations on a head unit under £200?

Thanks!