rear deck sound

how is the sound from the rear deck affected with subs playing in the trunk?

I don't understand what you mean "how is the sound from the rear deck affected with subs playing in the trunk". You need to expand a bit more on your question? p.n.

okay, I mean if I am playing mids and highs in my rear deck, are they going to be distorted by the low freqquency waves in the trunk? I know that sound waves can travel through cones, so will this be a problem? I have looked into getting foam baffles for my rear deck and door, but for different reasons. They're waterproof so that's good for my door speakers, but I think they help mids and highs in a rear deck. that's about it

The low frequency coming from the sub in the trunk should not affect your mid and highs if it is properly image. If you think that the sound coming from your speaker is distorted then you might want to try centering the FADE and BALANCE. Adjust the volume level so that all your mids and highs are playing at same volume level. Once all your mids and highs are adjusted then add in your sub for the low frequency. You can adjust the low frequency to your liking and the type of music that you listen to.     If you adjust the volume correctly to all your speaker the sub should not affect how your speaker sound, but rather compliment the music that it is accompanying.   As for the form baffle that you will put on. All it does is deepen and enhance the bass of the speaker with the sound reflecting of them. p.n.