My Three Sons - two front & one down - sealed - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 66 Old 10-09-07, 08:55 PM Thread Starter
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Talking My Three Sons - two front & one down - sealed

Hi guys,

After a month of intense study, reading and asking questions, I've finally begun my subwoofer build this past weekend...

I scrapped all my initial plans and decided that a design using three 12" drivers in sealed cabinets would suit me and my situation best. My build is using three 4 ohm DVC subwoofers by Polk. I will have a double stack front firing unit in one corner and a single down firing unit in the opposite corner. They will be powered by a Yamaha P2500S.

My wifes reaction to all this...

Without further delay; here comes the build photos. I'll post more as I make progress.

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post #2 of 66 Old 10-09-07, 09:11 PM Thread Starter
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Re: My Three Sons - two front & one down

Here's where I started on a Saturday afternoon - an unusually hot day for early October in central Virginia..more than 93 degrees. It was freak'n HOT! I finished up putting the third box together the following morning. Each box at this stage is 2.15 cf - internally 16x16x14.5

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post #3 of 66 Old 10-09-07, 09:20 PM Thread Starter
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Re: My Three Sons - two front & one down

Next up was to make a homemade circle cutter and cut the mounting holes. Taking a bite of not more than 1/8" at a time, it cuts like butter and dead-on accurate. This part was fun! I chose to place the speaker asymmetrical [not centered].

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post #4 of 66 Old 10-09-07, 09:24 PM
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Re: My Three Sons - two front & one down

Looks like you are off to a good start.

Have you modeled these?

That Yamaha amp... is that a pro amp?
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post #5 of 66 Old 10-09-07, 09:30 PM
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Re: My Three Sons - two front & one down

You'll have to tell me what you think of that Yamaha P2500S.
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post #6 of 66 Old 10-09-07, 09:31 PM Thread Starter
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Re: My Three Sons - two front & one down

Okay, here I'm cutting the 2nd layer front baffle. The fronts will be 1.5" thick. My circle jig is 1/4" MDF pivoting on a roofing nail - low tech...

Right now, I'm working on my internal braces, but duty calls and its another work week.

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post #7 of 66 Old 10-09-07, 09:39 PM Thread Starter
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Re: My Three Sons - two front & one down

Here's the 2/3rds part - the front firing double stack. This thing makes my little 8" AR look like a paper weight!...

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post #8 of 66 Old 10-09-07, 09:59 PM Thread Starter
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Re: My Three Sons - two front & one down

I modeled using WinISD, Unibox, Ported.xls, Sealed.xls and another online javascript app. All were pretty much in agreement: 1.96cf. The subs have a SPL of 93. 1w/1m. According to the models, it would be capable of roughly 118db - way more than ever I'll need. I modeled with a Linkwitz Transform - had a beautiful response, but cone excursion probs. The amp is the one on top of the stack.

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post #9 of 66 Old 10-09-07, 11:35 PM
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Re: My Three Sons - two front & one down

You mentioned using Polk subs. Are they the 12 inch Eosone's?



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post #10 of 66 Old 10-10-07, 07:28 PM Thread Starter
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Re: My Three Sons - two front & one down

Quote:
Mike P. wrote: View Post
You mentioned using Polk subs. Are they the 12 inch Eosone's?
Hi Mike,

I have a couple of the 10" Eosone's, but for this build I'm using GNX12DVC's. These are actually NOS [new old stock] car subs from a few years back...poly-mica cones, double stack magnets, dual voice coils in a very rigid / heavy duty powder coated stamped steel frame. I got them for a real good price and the specs are good. I gave them a quick model before comitting to the buy. By default, WinISD wants to put then in a Chebychev aligment at 4cf per driver. I wanted multiple drivers and SQ above low output - space is also an issue.

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