Question
 

I have a question im designing a box for my truck in the front im putting an 8 inch sub and thinking about adding speakers beside it, i was just wondering will the pressure levels and the sub mess with the sound coming from the speakers if their mounted within inches of eachother.

And help appreciated. thanks!

In my limited-knowledge opinion, yes.
I would imagine that when the 8" sub is being thrown in and out, it effectively changes the air-pressure within you enclosure. When it goes out, you'd have negative pressure, and when it comes in, you'd have positive pressure.
When the sub goes out, it would draw your other speakers in, and if they're trying to play the higher bass frequencies that are part of the same sound that the sub is trying to generate, then it'd cancel itself out.

Maybe get creative, and see if you can build a separate enclosure for those other speakers, and attach it to the sub enclosure, so when its all done, it looks like one piece.

Keeping them roughly the same disstance just seperating the enclosers? Will that make a difference there isnt much room for lots of air should i port the box?

if you use separete enclosers for the mids you should be ok. the distance apart would only affect your stereo imaging. It will not work if they share the same enclosure as the sub. They would basically become passive radiators. In other words everything would sound like chit! As for porting the box I wouldn't recommend it for the mid range speakers, but depending on the make and model of the sub it's usually a better idea to port the box if output is what makes you happy. That's assuming that the sub likes to be in a ported box. The manufactures recomendations should tell you if it wants a sealed or ported box, or even if it wil handle both.

I would not do it unless they were pretty far apart. The sub is going to resonate, so even if you use seperate (but in the same "big" box) enclosures, the sub may cancel our frquencies from the mids.

I understand space is probably at a premium, but why set up a potential problem area right off the bat? Even if there is a CHANCE it might sound fscked up, why do it?

Regarding ported box for small drivers, interestingly enough companies like CDT offer spec sheets with thier small components which include ported box volume, as well as sealed.

Ported anything is usually going to get you more volume for the same amount of power, but MOST (not all) ported enclosures do not provide as clean, precise bass as a sealed enclosure. Sealed is a bit tighter bass because the driver has to fight the air pressure inside the box (think a spring).

So ported is louder bang for your buck (power) but sealed is crisper bass but takes more power to get there.

Take pictures and let us know how its going!!

John

Thanks for all the help guys. I will take progress pictures for sure. The only reason i was thinking ported so the sub has air to breath so it dosnt starve.

as for the sub its a hertz ES 200