Sealed Sonotube Subwoofer - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 17 Old 12-03-06, 03:05 PM Thread Starter
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Josuah
 
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Re: Sealed Sonotube Subwoofer

I've got the clip limiters turned on on the EP2500. And I've been watching the lights on the DCX2496. So far, they've never gone above the second bar. Right now I've got a 28dB boost going using a pair of LP shelf filters each set at +14dB. It's chained as follows:

pre -> input 1 -> output 1 -> input 2 -> output 2 -> EP2500

Inputs 1 and 2 are linked with regards to their DSP settings.

Here is the response graph I've got so far, after applying about 11 EQ filters somewhat manually and somewhat suggested by Room EQ Wizard. But I'm not sure what's right yet because the 10Hz drop could be either a null or just represent issues at 11Hz that needs to be cut (unfortunately no outboard hardware EQ has 11Hz filters that I'm aware of). I'm going to need the newer Room EQ Wizard to know.
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post #12 of 17 Old 12-03-06, 03:14 PM
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Re: Sealed Sonotube Subwoofer

Awesome response! Job well done.

I wouldn't worry about much of anything else at this point,unless for some odd reason you're not satisfied with what you hear...

If you don't have a BFD for your sub, get one fast!
If you don't have REW, get it now!
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post #13 of 17 Old 12-03-06, 05:48 PM
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Re: Sealed Sonotube Subwoofer

Quote:
Here is the response graph I've got so far
What sound meter or mic are you using? Are you using the correct calibration file?

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post #14 of 17 Old 12-03-06, 09:25 PM
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Re: Sealed Sonotube Subwoofer

Good question Bruce. I assumed the answer to that was a yes.

If you don't have a BFD for your sub, get one fast!
If you don't have REW, get it now!
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post #15 of 17 Old 12-04-06, 12:27 AM Thread Starter
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Josuah
 
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Re: Sealed Sonotube Subwoofer

I'm using the new digital Radio Shack SPL meter with the correct calibration file loaded. Also my soundcard response loaded. You can see the two lines on the graph. I'm leaning towards the 11.5Hz being a peak, rather than the 10Hz being a null.
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post #16 of 17 Old 12-05-06, 05:10 PM
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Re: Sealed Sonotube Subwoofer

Your response curve would be even more flattering using the forum's preferred axes limits.
Stretching to 10Hz is quite acceptable for those with something to show in this area.

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post #17 of 17 Old 01-24-07, 12:05 AM Thread Starter
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Re: Sealed Sonotube Subwoofer

Now that REW 4.0 has been released, I can post the <10Hz measurements I took of these subwoofers. I'm running two LP shelf filters to boost low, and about a dozen PEQs IIRC. I used Sonny's ECM8000 calibration mic and extrapolated to -12dB at 5Hz. Here's the graph.
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