Based on your posts, i'm assuming that your HU is driving your Blaus and Pioneers speakers directly (with no amps or processors in between).

If that's the case and you are experiencing static problems, my best bet would actually be the wires connected to your HU being the culprit.

What I can suggest at this point is to install your own set of power and ground wires for your HU. Since you're at it, might as well install a thick set (around 12 gauge). Just remember to put 2 fuses on the power wire (one near the battery and one near the HU).

For the ground wire, try to tap it to a clean, unpainted portion of your car, nearest to your HU. The shorter the ground wire, the better.

While you're at it, try installing na rin an aftermarket set of speaker wires going to your 4 speakers.

The rationale behind is that the wiring system of almost all cars makes use of a common ground wire. This means that there is only one or two ground wires in which different stock accessories are connected to it (which includes your radio).

Sometimes, too much pull from the different accessories would cause a voltage fluctuation within the HU thereby manifesting itself as a static.

Another alternative is to check your high-tension wire if its able to effectively suppress the RF noise generated by your ignition system. This too could be a source of static if RF noise is leaking and is picked up by your HU.

Both of my suggestions are merely based on previous experience and acquired knowledge. There can still be other probable causes of your static problem. Tsikot peepz, feel free to correct me if i'm wrong and to suggest other alternatives in case my suggestions don't work out.

HTH! Do let us know how things turn out! :D