I am looking to buy some new ( but quite cheap ) car speakers ( 6x9)
My stereo is quite good , its a panasonic 50 x 4 .... however, i dont know what this means.
I think 50x4 means it can put out 50w MAX x 4 channels, safe bet around 20w rms per channel off a deck which is pretty standard. If you're looking for cheap speakers to replace stocks, take a look at the low end pioneers. they are cheap and are a big improvement over stock and runs fine off the deck
Walking into a car audio shop, and listen to their speakers on the board. Pick the one you like most. Don't buy a very expensive speaker as the rest of your audio setup seems pretty basic (no amplifier).