Tip & How-To about Car Audio & Video

Box specs and airpsace for 12 inch subwoofers

Regardless of your wattage rating on your sub woofer, sub woofers differ in only one way. You get an "Open Air" and a "Closed air" Sub woofer, That being said, you'll have to check on your magnet which one you have, to make the boxes for that particular sub woofer. If it is an "Open air" Sub woofer, you should see a hole with "wire mesh" or "metal grid" in the center, at the back of the magnet. If it is a "Closed air", the magnet will be solid with no hole whatsoever.

If it is a "Open air" sub, your boxes should always be sealed with silicone sealant, and no ports are to be cut in your box.

Regarding the "Closed air" sub woofers, you should have 2 ports cot in the corners of the boxes just below your sub on the face of the box, and the port sizes should be around 50mm in diameter. Get yourself some 50mm PVC drain piping to use as ports. Firstlycut yourself a 100mm piece and insert flush with the front of the box. Test your sound. then try a 150mm piecs and test again. You should start with a 100mm long piece in the one box and add 50mm increments to "tune" the port up to 250mm, depending on the frequency of bass you require. Carry on testing the sound on each increment until you find the sound you want, Then silicone the port to the box for permanent fixing.

On a 15 inch Sub woofer ranging between 80Hz and 100Hz, the ample box size required should be around 27 liters, meaning that you will end up with a box of 13 inches high, x 13 inches wide, x 13 inches deep. Or 400mm high, x 400mm wide, x 400mm deep.

Posted by on

Car Audio & Video Logo

Related Topics:

Related Questions:

1 Answer

i got vauxhall astra 1.6 and planning to put 1800w bass sub woofer. Can I do that, does astra can handle that.

If it is clean power it can handle it. Bad power causes distortion and DC output. That is what kills the sub woofer. The going rate for quality / good wattage is a dollar per watt. If you are not spending that much, then it is bad power.

Nov 01, 2013 | Cars & Trucks

1 Answer

how many total watts

The power rating for this amp is as follows.
Two channel: Sub woofer: Min 35Watts
Two channel: Other than sub woofer : 70Watts
One channel: sub woofer; 100Watts
One channel: other than sub woofer: 200Watts.

Dec 17, 2011 | Pioneer GM-X332 Car Audio Amplifier

1 Answer

the transformer of my sub-woofer is burnt. When i take it to the repair shop, they say that the transformer is not available. I badly need to fix the speaker as i love them very much and the new ones are not that good. Please suggest a solution for this. Thanks,

Sub woofers have small amplifiers , not transformers. The amplifier is removable and replaceable. The The overall size and the output wattage are the spec's you need . The output wattage is on the label which is attached somewhere on the speaker. You do NOT need to replace the amp with the Altec Lansing brand. Have you contacted Altec Lansing to purchase a replacement Amp? That's where I would start. If they cannot help you I would Google replacement amp sub-woofer, Altec Lansing model MX5021.
good luck

Apr 15, 2011 | Altec Lansing MX5021 System

Not finding what you are looking for?

4,283 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Car Audio & Video Experts

xxxxxx xxx

Level 3 Expert

4834 Answers


Level 3 Expert

75066 Answers

The Knight
The Knight

Level 3 Expert

73647 Answers

Are you a Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions