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Old 28th February 2013, 08:52 AM   #1
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Default Sub box specs help

Hi new to DIY and building speakers all together. My cabinetry skills far outshine my knowledge of building speakers. I am building a sub box for a home theater. I am however using a boston acoustics g1 10" car sub. Speaker choice opinions aside I have read that car audio boxes are spec'ed out differently because they go in your car. I built the recommended .5ft3 box and its ok, but just ok. I was looking to build band pass box or a box with passive radiation. I'm told not to do the rads though because of the Q rating. I'd love to go this way with a big radiator but if its unwise I won't. If not I am going to build a ported box. I'd like to build only one more box as this time it's going to get a veneer and finish. I'm attaching a link to. The spec page for the speaker, it is the g1104 model.

http://www.bostonacoustics.com/Docum...r/US/G1Man.pdf

If anyone can help me find a good box size it would be great. I tried a calculator but it seemed like I did something wrong
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Old 28th February 2013, 11:49 AM   #2
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Yep that is a design for a car and relies in cabin gain to get any low end.
For home use a large vented box (3cft) witha long port 5"x19" would work better.

Here is a simulation vs. the closed box.

Click the image to open in full size.
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Old 28th February 2013, 12:29 PM   #3
bjorno is offline bjorno  Sweden
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Hi, FYI

b
Attached Images
File Type: jpg Boston-Acoustics_g1104.JPG (814.0 KB, 76 views)
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Old 28th February 2013, 12:38 PM   #4
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Bjorno like I said not too keen on the technical side of building a box. Although I'm only on my phone. Ill have to look that over later
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Old 28th February 2013, 07:58 PM   #5
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So if I'm going to build a box with a port that size it would be easier for me to do a slot. Given a width of 9.75 inches what would the height and width be on that? It would be below the regular box so not to ruin the volume
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Old 28th February 2013, 09:45 PM   #6
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Quote:
Originally Posted by Jeremy067390 View Post
So if I'm going to build a box with a port that size it would be easier for me to do a slot. Given a width of 9.75 inches what would the height and width be on that? It would be below the regular box so not to ruin the volume
Sorry height and length
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Old 1st March 2013, 12:04 PM   #7
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What's going on here?
Jeremy067390, you are set with a BR type? What size?
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Old 1st March 2013, 01:02 PM   #8
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Jeremy,
Better reproduction in a quarter wave or a sealed enclosure.
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Old 1st March 2013, 01:24 PM   #9
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Inductor what size sealed box?also I googled the quarter wave and I like it, but how do you design that? How many baffles, size ect?
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Old 2nd March 2013, 09:12 AM   #10
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VB = 60.0 L for a QTC = 0.707.
I'm not an expert in quarter wave but bjorno is always posting a project for one.
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