Ford Focus Mk2.5 Door Speaker Sizes And Adaptors.

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Hello all I'm sure this has been asked on here before but haven't come across much. I am wanting to upgrade my door Speakers and tweeters. Ideally I wouldn't mind upgrading for better oem Speakers for a direct fitment.

Also does anyone know what the rms is for the standard Speakers. I'm asking because if I can buy some speakers with the same power I shouldn't need to run a crossover and use amps. I had a sound system in my old fiesta but I knew the wiring on that but because now days these cars are getting more complex I want to try and keep everything safe and easy without having to cut and chop anything or strain the car.

Would be cool if anyone could poi t me to some information about oem upgrade/ aftermarket speakers but only similar to oem ratings.

Many thanks Ryan