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<blockquote data-quote="monopoly9182" data-source="post: 8503951" data-attributes="member: 670023">Okay so About a week ago I decided I was going to build a sub box to fit next to the spare tire in my car. I planned it all out, got all the wood cut, built the box and put the sub in it to test it out. From inside the car the bass was decent but when it was turned up it sounded pretty bad. So I went to the trunk to listen to it and it sounded really bad no matter what the volume was. There&#039;s a lot of air noise and when it&#039;s turned up you can hear the sub making some type of thumping noise but not in a good way.So I think I just did the port wrong. I did some math and found that the cubic ft was around 1.5, then I used a port calculator online and made a 3 inch circle port 7 inches deep. I just used pvc pipe for the port.I&#039;m not sure if I did any of this correctly this is my first time making a box and I don&#039;t have much experience with subwoofers/boxes anyhow.So I came here to find out how I can fix it and make it sound betterThe sub woofer is a Rockford fosgate p3d4-10 punch p3 1000 watt and I&#039;m not sure what the amp is. I just got it from a friend he says its 1000 watt with 500rms.I know this sub and amp work cause I&#039;ve used them in another box before and it sounded finepicture is a top view (port is on top of box)</blockquote>

[QUOTE="monopoly9182, post: 8503951, member: 670023"] Okay so About a week ago I decided I was going to build a sub box to fit next to the spare tire in my car. I planned it all out, got all the wood cut, built the box and put the sub in it to test it out. From inside the car the bass was decent but when it was turned up it sounded pretty bad. So I went to the trunk to listen to it and it sounded really bad no matter what the volume was. There's a lot of air noise and when it's turned up you can hear the sub making some type of thumping noise but not in a good way. So I think I just did the port wrong. I did some math and found that the cubic ft was around 1.5, then I used a port calculator online and made a 3 inch circle port 7 inches deep. I just used pvc pipe for the port. I'm not sure if I did any of this correctly this is my first time making a box and I don't have much experience with subwoofers/boxes anyhow. So I came here to find out how I can fix it and make it sound better The sub woofer is a Rockford fosgate p3d4-10 punch p3 1000 watt and I'm not sure what the amp is. I just got it from a friend he says its 1000 watt with 500rms. I know this sub and amp work cause I've used them in another box before and it sounded fine picture is a top view (port is on top of box) [/QUOTE]

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