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Old 2nd September 2013, 04:16 AM   #11
BHTX is offline BHTX  United States
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As already pointed out.. with a Qes that high, I'd put it in a large sealed enclosure, and EQ it a bit, using the most powerful amplifier you have on hand. I haven't done any sims yet, but a suitable ported enclosure would likely be ridiculously large.

Edit: WinISD Pro says 10.1 cubic ft for 0.707 Qtc, 28-29 Hz F3. And that's if the T-S parameters are accurate. Qts is often higher than spec'd. So, build the largest sealed enclosure you can tolerate, stuff it with several pounds of polyfill (or whatever), and be done with it. You can apply a tiny bit of boost on the low-end, but only a little, and only if the EQ can target 20 Hz or less. A digital low shelf will work best. And you will need quite a bit of power.

Edit again: 20 cubic feet tuned to 15 Hz would also work..

Last edited by BHTX; 2nd September 2013 at 04:35 AM.
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Old 2nd September 2013, 04:23 AM   #12
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Originally Posted by BHTX View Post
As already pointed out.. with a Qes that high, I'd put it in a large sealed enclosure, and EQ it a bit, using the most powerful amplifier you have on hand. I haven't done any sims yet, but a suitable ported enclosure would likely be ridiculously large.
How ridiculous? Curious minds want to know

Is there a good website where I could model this sub in a sealed enclosure to see how it does at around 17hz?? Is that too low to expect much output from a sealed enclosure?

-Jamie M.
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Old 2nd September 2013, 06:51 AM   #13
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Comparitvly, its "not expensive". however, anything that costs 360 is expensive in my book. more than half a months rent.
One big difference, the driver costs are once, your rent is to be paid again and again, every month...So that's not a comparison.
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Old 2nd September 2013, 06:55 AM   #14
sine143 is online now sine143  United States
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It is a comparison when i buy a speaker driver, cant pay rent that month and get evicted lol
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Old 2nd September 2013, 12:06 PM   #15
Ile is offline Ile  Finland
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Get one or three more and make IB.
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Old 2nd September 2013, 02:06 PM   #16
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Originally Posted by toysareforboys View Post
How ridiculous? Curious minds want to know

Is there a good website where I could model this sub in a sealed enclosure to see how it does at around 17hz?? Is that too low to expect much output from a sealed enclosure?

-Jamie M.
Jamie, yes.
Subwoofer Box Enclosure Design Calculator - Sealed Ported Bandpass Closed Vented
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Old 2nd September 2013, 03:14 PM   #17
Scott L is offline Scott L  United States
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Default 2 ohm coils

One issue no one has brought up yet, is how to handle those 2 each@
2 ohm voice coils (?)

One option is to series them for a more stable 4 ohm load, but the series thing is often frowned upon.
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Old 2nd September 2013, 08:01 PM   #18
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Sweet, thanks. I'll get plugin numbers in.

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Originally Posted by Scott L View Post
One option is to series them for a more stable 4 ohm load, but the series thing is often frowned upon.
I was going to run the voice coils in series, 4 ohm bridged on say EP2000 or similar. What are the issues running voice coils in series?

-Jamie M.
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Old 2nd September 2013, 08:21 PM   #19
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Wow?

Click the image to open in full size.

That +4db at 17hz has me excited, but is that 42.5 cubic feet correct?!

-Jamie M.
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Old 2nd September 2013, 08:35 PM   #20
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Originally Posted by toysareforboys View Post
That +4db at 17hz has me excited, but is that 42.5 cubic feet correct?!
Jamie,

Sounds like it could be correct, and it probably will hit the excursion limits with a lot less than full power in that large of a box.

I'd try a tapped horn like the Gjallerhorn if considering a 4 x 4 x 3 foot box.
That would give a lot more "wow".

Series voice coils are not a problem as long as the polarity is correct.
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