[944sracer]

The ideal way depends on what type of amp you are wanting. I.e. Sub or speaker amp. If it's a sub only, I would run the power inside the car down the passenger side. Doesn't matter on which side of the seat. This allows for maximum wire for you to have when mounting your amp. Nothing is worse than running all your wires only to find that your short 6". You need the inline fuse at the battery not the amp. You can run all the wires down the same side. (power, remote, and rca). This is because the emf put off from the power wire will be filtered out by the sub when you tune the amp. Sub crossover frequency should be 80Hz or lower.

If you are installing a 4-channel for your speakers the power and remote need to be on the passenger and the signal (RCA) need to be on the driver. Otherwise you get alternator whine. This means that the emf that is given off by the high voltage/amperage power wire will bleed over and corrupt your low voltage signal wire coming from the deck to the amp. (12v for power wire and 2-4 volts for your RCA signal wire). Since the speakers will be playing at all frequency levels high and low. Speaker wire can be run down either but I would run it down the power side as it is amplified and will not suffer from the emf.

No matter what you must use high quality wire (not from wal-mart) and run it on the inside of the car.

Sorry for the long answer but now you know the why behind the what.