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15 inch Cabinet Design??
15 inch Cabinet Design??
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Old 25th January 2008, 12:39 AM   #91
nunayafb is offline nunayafb  United States
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Alright that pic turned out bad, the steep rolloff grayish line is the butterworth alignment, the other is the 15"

The next pic shows what I mean for removable baffles and such, this is not complete, you'll need to dimension everything and add bracing and such. But it should give you enough to get going on the "di" part of "diy" I think you will learn a lot from trying this project.

In addition if you use a shelf brace inside with a single large cutout (plus port hole) you can close it off and hear how the QB alignment will sound as well, all you have to do is locate the brace where it will create a 1.3ft^3 space in front of it.
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Old 25th January 2008, 02:06 AM   #92
Chicho is offline Chicho  Australia
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This is good, I will try that and report on the findings.

I have a RadioShack sound pressure meter, will this be accurate to measure low frequencies?

If so how could I measure it?
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Old 25th January 2008, 02:43 AM   #93
GM is offline GM  United States
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BTW, what brand/model 12" is this? A pity you're so space limited, it kicks 'booty', pounding your eyeballs flat in a simple corner loaded ~300 L tapped horn if the specs are reasonably accurate:

GM
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File Type: gif chico's 12' 14.14 conic th.gif (19.5 KB, 109 views)
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Old 25th January 2008, 02:49 AM   #94
Chicho is offline Chicho  Australia
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Fusion FPW-1200, it's an automotive speaker.
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Old 25th January 2008, 03:04 AM   #95
GM is offline GM  United States
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Thanks, unfortunately it's been discontinued, so don't blow it.........

GM
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Old 25th January 2008, 03:15 AM   #96
vasyachkin is offline vasyachkin  United States
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Quote:
Originally posted by Chicho
Fusion FPW-1200, it's an automotive speaker.
automotive speaker ? who could have thought

artificially wide surround and a logo stamped into the dust cap ... this is so not like the automotive speakers we all know and love
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Old 25th January 2008, 03:18 AM   #97
GM is offline GM  United States
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Some RS SLMs need a correction curve: http://www.hometheatershack.com/foru...n-results.html

Measuring low frequencies in-room is problematic with an SLM, but it's better than nothing. Place it at ~ear height in the 'sweet spot' on some form of tripod with its mic on edge and perpendicular to the sound wall to get an idea of what your ears are receiving.

GM
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Old 25th January 2008, 07:45 PM   #98
bjorno is offline bjorno  Sweden
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Chicho,FYI

Based on the given 12" DVC woofer data:

xmax=12
vas=62l
fs=28.5
qts=0.35
qms=3.95
qes0.391

See your 12 driver data somewhat expanded and simulated in picture 1(2).
If the referred TS data are true and collected when using one of the coils, the Qts value will be modified from 0.35 to 0.1853 when the coils is series or paralleled, also note that the coils in series will double the BL value.

If the driver coils are connected in series and parallel and put in a 50L ported box, see picture 2(2).

b

1(2)
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Old 25th January 2008, 07:47 PM   #99
bjorno is offline bjorno  Sweden
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2(2)
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