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Author Topic: 2242 response  (Read 2604 times)

Jacob Shaw

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2242 response
« on: July 17, 2015, 07:48:00 pm »

This isn't an acceptible response is it?  The jbl 2242 has a vas of 287L.  I modeled 2 of them in a 575l cabinet, and got this.  I played around with the volume and tuning and this is the best I could come up with, short of making the enclosure tiney at wich point it lacked extension.
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David Morison

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Re: 2242 response
« Reply #1 on: July 18, 2015, 10:05:55 am »

This isn't an acceptible response is it?  The jbl 2242 has a vas of 287L.  I modeled 2 of them in a 575l cabinet, and got this.  I played around with the volume and tuning and this is the best I could come up with, short of making the enclosure tiney at wich point it lacked extension.

Seeing as you've cropped off both the Y axis and the box size & tuning, it's impossible to tell.
For all we know you've got it set to show 1dB per division, which wouldn't be too bad at all.
If you're at 10dB per division, that'd be a lot worse.

EDIT - on looking a bit closer, I think you're at 2dB/div with the level at 40-50Hz on 132dB, right? If so, that's certainly in the ballpark of what I'd expect from these drivers @ "program" power. Have you checked the Excursion at that level yet?

« Last Edit: July 18, 2015, 06:39:06 pm by David Morison »
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Lee Buckalew

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Re: 2242 response
« Reply #2 on: July 18, 2015, 03:14:16 pm »

This isn't an acceptible response is it?  The jbl 2242 has a vas of 287L.  I modeled 2 of them in a 575l cabinet, and got this.  I played around with the volume and tuning and this is the best I could come up with, short of making the enclosure tiney at wich point it lacked extension.

JBL recommends 1 driver per enclosure.  If making a dual they recommend that it be two, separated internal cavities.  They recommend a tuning of 40Hz.

Lee
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Lee Buckalew
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Jacob Shaw

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Re: 2242 response
« Reply #3 on: July 19, 2015, 01:34:48 am »

Yes, the excursion plot is good.  I was just worried about the peak near 100hz. 
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David Morison

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Re: 2242 response
« Reply #4 on: July 19, 2015, 03:54:44 am »

Yes, the excursion plot is good.  I was just worried about the peak near 100hz.

If you need to flatten that, a wide shallow PEQ set to maybe 300Hz would help quite easily.
It's not unusual for a box to have a response that's sightly skewed from flat (the STX828s uses these same drivers so you can get a bit of a comparison from that if you like) so things like out of band PEQ's are perfectly reasonable solutions.
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ProSoundWeb Community

Re: 2242 response
« Reply #4 on: July 19, 2015, 03:54:44 am »


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