How to find dimensions for a box in a car?

I own a 2000 Honda Civic, and I'm getting a system for it but you need a box. My father will make the box for me but refuses to help me find the dimensions for it. Does anyone know what to measure? I'll post picture of inside of my car if necessary

I hope your father has some sort of experience in car audio. The box has to be properly made for the sub that you have to get the best output. Some subs perform better in a ported box. Some subs perform better in a sealed box.

You have a small car. But the Honda civic is a great car for building a loud system if done properly.

If you're so concerned about the space and dimension, get a measuring tape. Go measure your trunk and the opening of the trunk. Or go measure the area where you want to put the sub. When your father makes the box, make sure he does NOT exceed those dimensions. Ever heard of Google, lazy bones? Is that why your dad won't help so that you'll have to actually put forth some effort for a change?

Here's a head start:

Good luck & enjoy the experience. Make a cardboard replica of the box you want. Need some cardboard, a craft knife and some parcel tape. Make sure it fits, trim and rebuild if it doesn't. Then once you are sure it's correct, give it to your Dad and have him make it the same size. The right dimensions also should consider the box's volume per the speaker's frequency response. You can make a box a pretty as aw get out but have it so inefficient it degrades the sound somewhat and you end up with the amp getting more hot than it should. Sometimes you can't optimize when your space for it is too small. Give yourself a fair chance and look in here "the12volt.com" in the section on speaker enclosures. This is a woodshop project, but it also is an electronics project as well.

Ever heard of Google, lazy bones? Is that why your dad won't help so that you'll have to actually put forth some effort for a change?

Here's a head start

Make a cardboard replica of the box you want. Need some cardboard, a craft knife and some parcel tape. Make sure it fits, trim and rebuild if it doesn't. Then once you are sure it's correct, give it to your Dad and have him make it the same size.

The right dimensions also should consider the box's volume per the speaker's frequency response. You can make a box a pretty as aw get out but have it so inefficient it degrades the sound somewhat and you end up with the amp getting more hot than it should. Sometimes you can't optimize when your space for it is too small. Give yourself a fair chance and look in here "the12volt.com" in the section on speaker enclosures. This is a woodshop project, but it also is an electronics project as well.