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Rockford Fosgate T2 12D4 box problem
Rockford Fosgate T2 12D4 box problem
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Old 20th September 2018, 01:27 AM   #1
AlexanderLeet is offline AlexanderLeet
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Default Rockford Fosgate T2 12D4 box problem

Hi, Iíve got this subwoofer, someone made me a box for it and I think itís not built ok, I think the port is too big.
What do you guys think?

The dimensions are: 28,7Ē x 13,3Ē x 18,2Ē

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Old 20th September 2018, 06:45 AM   #2
Jonhny is offline Jonhny  Sweden
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My aproximation is 60L tuned to 40Hz. Seems normal by US caraudio standards.

How does it sound?
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Old 20th September 2018, 08:17 AM   #3
AlexanderLeet is offline AlexanderLeet
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So, it seems normal? I donít feel the bass from every songs, it sounds more like vibrations and not that hard hitting bass. It could also be because I have a weak amp? (MTX XThunder X1000D and Pioneer DEH-X5900BT which has 2v preamp outputs; a 4v+ preamp is noticeable, right?)
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Old 20th September 2018, 11:09 AM   #4
Brian Steele is offline Brian Steele  Grenada
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40 Hz is actually a little higher than I'd use for a 12" driver with 19mm Xmax, destined for car audio duty. But it sounds like perhaps the LP filter on the amp is set a little too low. That, coupled with the big peak at low frequencies caused by a peaky box and cabin again could result in that "tractor driving down the street" sound like that I love to hate about most car audio setups I've heard.
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Old 20th September 2018, 11:20 AM   #5
AlexanderLeet is offline AlexanderLeet
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The LP filter is set to the highest (200Hz) on amplifier and off on head unit. The guy who designed the box told me itís tuned at 37Hz, but Iím not sure about this box being correctly made for this RF driver.
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Old 20th September 2018, 01:10 PM   #6
Brian Steele is offline Brian Steele  Grenada
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Try moving the box forward until it's about 4 inches from the front of the trunk.

What drivers are you using for mid-bass, and where are they located?
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Old 20th September 2018, 06:15 PM   #7
Jonhny is offline Jonhny  Sweden
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You have the box in a sedan? They are often difficult.
37hz may very well be what the tune is. A bit high perhaps.

Also, car audio fans often wants to be loud. Then they play rap. It vibrates and flexes, perfect for demos.
I noticed that Steve Meade often have rock in the background while installing caraudio. But in the car he plays rap or bass tunes. It is simply easier to play 30-50hz in a car than 60-80hz. The car has loads of cabin gain under 50hz. But often 60-70hz is weak unless played with midbasses up front (or at least not in trunk). So most people use the music that impresses in a demo situation. Hearing a car that really has power all the way from 30-80hz is quite impressive.
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Old 20th September 2018, 07:50 PM   #8
AlexanderLeet is offline AlexanderLeet
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Yes, sedan...
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