First HT DIY Subwoofer for a noob on a budget.. - Page 6 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #51 of 100 Old 08-29-13, 10:41 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Hey Mike, getting close to build time and a couple questions are on my mind. First, the wife demanded the smallest enclosure possible, so I went with the 6ft^3 20hz boxes. I managed to get the ok for both subs . After factoring in the cost of the laminate and mdf, I realized that these enclosures may be around a while. These Phoenix subs are old, but never installed. What if I build these and the subs suck, or fall apart? Can you recommend a current, affordable driver that likes a 6ft^3 20hz box?
Second question, trying to keep these 6 cube boxes as small as possible, and wondering if hardwood bracing inside an mdf cabinet is ok? Lets say I used oak bracing. What would a minimum total cu ft of bracing add up to and still be effective?
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post #52 of 100 Old 08-30-13, 04:32 AM
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Re: First HT DIY Subwoofer for a noob on a budget..

If you want to future proof the cabinets then you need to change the porting from two 3" flared ports to two 4" flared ports or a slot port.

Once you decide on either 4" ports or a slot port and what the cabinet dimensions are then we'll figure out the bracing.

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post #53 of 100 Old 08-30-13, 08:34 AM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Here is my plan. Allowed .2FT^3 for the driver based on the spec sheet, and about that much again for bracing. Will be adding a second layer of baffle over the front to flush mount the sub.I think i was able to lower the tune a little more by lenghtening the back port board, but that reduced the available box volume for bracing a little also. Hence the question about minimum bracing and or reducing the size of said bracing by material selection.
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post #54 of 100 Old 09-01-13, 10:15 AM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Tweaked a hair to lower the tune a little. Hoping .25ft^3 is enough bracing. MikeP, your thoughts? Dont have a clue if it matters, but it will be oriented like the picture, on its side. With a .75in thick laminated top, 2in larger than the box it self, layed on top of the fully enclosed box. Trying to match exsisting furniture design.

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post #55 of 100 Old 09-01-13, 12:48 PM
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Re: First HT DIY Subwoofer for a noob on a budget..

The design looks good. You'll need 2 vertical braces, one front to back in the middle with a relief cut out for the driver and one running from side to side.

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post #56 of 100 Old 09-01-13, 03:32 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Did you mean something like this?
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post #57 of 100 Old 09-01-13, 05:23 PM
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Re: First HT DIY Subwoofer for a noob on a budget..

That would do it with a 3" wide frame.

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post #58 of 100 Old 09-01-13, 07:48 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Cool, now I should head back to your enclosure volume calculator and see how much volume that frame with a 3in x .75in size will occupy, correct? If under .24, I can add more bracing, if over .24, I need to increase the box volume a little, and port length to get back to 6ft and 20hz, correct? Or leave it alone if its within 10%, as I think I've I read you tell other rookies in the forums?
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post #59 of 100 Old 09-01-13, 08:31 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Using that design with 3in by .75in material, I came up with 0.182944 cu ft of bracing out of .24 allowed. Add a couple little horizontal braces inside the slot, or bad idea?

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post #60 of 100 Old 09-01-13, 09:21 PM
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Re: First HT DIY Subwoofer for a noob on a budget..

Good idea, and then you're set to go.

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