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Old 21st June 2008, 09:11 PM   #1
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Default Seas Test Baffle Dims?

Hi,

Would someone be so kind as to pass along to me the test baffle dimensions used by Seas for their published curves?

The driver in question is an H1333. Same question for an E0041.
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Old 21st June 2008, 10:40 PM   #2
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The E0041 is quoted at 7 L volume,

the H1333 is quoted at 12 L,

no other dimensions.
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Old 21st June 2008, 11:16 PM   #3
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I think it was 1mx1m. Open a couple spec sheets on seas drivers and the test baffle is indicated under the response graphs.
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Old 22nd June 2008, 02:31 AM   #4
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Thanks for the suggestions, guys.

Does IEC specify a standard baffle size for small and medium sized mid-woofers? I've seen reference to such a table, but it stopped at 8" drivers, and both drivers I'm fiddling with are smaller than that.

Thanks!
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Old 22nd June 2008, 09:08 PM   #5
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Below is one of the Seas test boxes used by Seas (image provided by Bjorn Idland from Seas with various data measurements). It is an 18L so may not be appropriate for your situation. Notice the replaceable sectional baffle.

This (Courtesy of Bjorn) is the description of the Seas test box:

Box
The box outside dimensions:
Front baffle: 20cm wide and 49.6cm high
Box depth: 29.6cm
Edges are trimmed with a roundover-bit r=12mm.

Driver placement:
Both drivers are centered on the vertical axis.
The distance between the drivers centers are 158.5mm
The distance from the top of the baffle to the tweeter centre: 65mm
The distance from the top of the baffle to the woofer centre: 223.5mm

The box has a removable tweeter baffle. This way we can measure all drivers flush mounted in the same box.
The box is approximately 18 liters and the port tuning is approximately 40Hz. All woofers are measured like this, regardless of what the T/S calculations suggest.

Cheers,
David.
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File Type: jpg test box.jpg (87.1 KB, 195 views)
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Old 23rd June 2008, 12:17 AM   #6
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Quote:
Originally posted by Dave Bullet
Below is one of the Seas test boxes used by Seas (image provided by Bjorn Idland from Seas with various data measurements).
This is helpful. Thanks!
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Old 23rd June 2008, 12:53 AM   #7
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Hi there,

Bjorn is a pretty helpful guy. You might be able to PM him for an answer / to clarify my post:

http://www.diyaudio.com/forums/membe...o&userid=12635

Cheers,
David.
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Old 23rd June 2008, 08:14 AM   #8
bidland is offline bidland  Norway
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Hi,

We have posted some info about our test boxes on our web page.
See the link on the second line here:

http://www.seas.no/index.php?option=...180&Itemid=175

The box in the picture above was used for a series of measurements we did to aquire data for crossover simulation. This is not a box we use for measurements that go in the datasheets.

Bjørn
Seas
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Old 23rd June 2008, 04:52 PM   #9
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Quote:
Originally posted by bidland
We have posted some info about our test boxes on our web page.
See the link on the second line here:

http://www.seas.no/index.php?option=...180&Itemid=175
Thank you, Bjørn.

That pretty much answers my original question. I'm planning to use the dims for crossover modeling as well.
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Old 23rd June 2008, 05:57 PM   #10
Corax is offline Corax  Germany
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Hi folks,

just for information purposes, there's (at least in Germany) a so called DIN baffle - which is an open baffle for amplitude-frequency response measurements - with the following characteristics:

size:
width 135cm (approx. 53.15")
height 165cm (approx. 64.96")

the chassis is mounted off-center by the following offsets:
horizontal 15cm (approx. 5.91") (either left or right, doesn't really matter)
vertical +22.5cm (approx. 8.86") (direction to the top)

The influence of the baffle will be +1.0/-1.5 dB above 250 Hz and with up to +/- 2.5 dB deviation measurements down to 40 Hz are possible. The microphone has to be mounted - of course - at a distance of 1 meter (= 100 cm or approx. 39.37") at 0° horizontally/vertically to the driver - which lead to the SPL diagram in dB/W/m.

My plans/drawings are already made with a modular setup for different chassis diameter and a flat baffle mount. Therefore only the smallest possible baffle cut-outs for various chassis' needs to be made once and can be interchanged for all the measurements.


It might be the case that for instance Seas does not rely on that DIN baffle but other manufacturer (besides the german once) do rely on measurements done with this DIN baffle for comparison purposes.
I would wish that only all measurements were taken in the same manner for better comparison - and it must not be necessarily the DIN baffle.
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