sub box, 2000 chevy extended cab

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=121800
Printed Date: September 11, 2025 at 11:43 PM

Topic: sub box, 2000 chevy extended cab

Posted By: tj546
Subject: sub box, 2000 chevy extended cab
Date Posted: May 12, 2010 at 11:07 AM

I have 4 12" earthquake LS subs going in my 2000 chevy extended cab truck. the box is 38w 26t 18.5d=8.79qf the port is 9.5tall 12 wide and 13.67 long. the box dosent sound good at all loud as hell in my shop but sounds like hell in my truck. i have more than enough power for these subs just could use some help with this. oh the subs are facing up vented out the front of the box.

Replies:

Posted By: tj546
Date Posted: May 12, 2010 at 11:18 AM

the subs are older but new ive had them for a while. the vent tuning is 43 hertz

Posted By: tj546
Date Posted: May 12, 2010 at 12:02 PM

i need helpwith this please!!!!

Posted By: eric21
Date Posted: May 17, 2010 at 10:12 AM

I have a crew cab with 4 12" alpin type r's and had the exact same problem - it sounded like garbage even with 3000 watts. I had a center port with the

posted_image

subs around it like in the picture. It sounded best pointed up but still not very good.

My next box I built had the 4 12's along the bottom with 2 areo ports like the picture below
posted_image

This box sounded much better than the last and sounded best pointed foward. The size was about 9cu.ft. net. I later shrunk it down to 7cu.ft. net, it lost some low end but picked up the high bass alot better.

I think what I would do if I was you is to build a box with the subs foward and one long port along the back top of the box. It may not follow the 7 to 1 rule with port dimensions but i've seen and heard it before and it sounded good. I would divide the box into 2 chambers, so 2 ports along the top back of the box.