Displacement for Ascendant Audio Avalanche 18 inch subwoofer??? - diyAudio
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Old 11th June 2005, 07:33 AM   #1
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Default Displacement for Ascendant Audio Avalanche 18 inch subwoofer???

Wow, I spent alot of time designing an enclosure, and halfway through, I realized that I didn't factor in the displacement of the subwoofer. Their website doesn't list the displacement, or maybe I missed it. Anybody know the displacement???
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Old 11th June 2005, 09:40 AM   #2
theNoid is offline theNoid  United States
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I would guesstimate close to .25 cubes. What type and tuning of an enclosure are you designing for it?

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Old 30th June 2005, 04:32 PM   #3
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Whoa, talk about a delayed response on my part. I am putting two of the 18s in my Durango. I have about 15.7^3 of space I can use, I want to shot for 7.5^3 of useable airspace for each sub. Tuning will probably be between 35 and 35... not sure yet though. Still waiting on them to arrive... I heard they shipped them yesterday, but I am not going to call and bug them about it, ill just wait a few days, since they are shipping from Crystal Lake Il, and I am in Rock Island, Il. It will probably take the slow pokes at the Fed Ex terminal a day or two to have those things SWAKed and on the way to me. I am extremely eager to get them. I will probably end up staring at them for a few hours before I even touch them.
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Old 30th June 2005, 07:55 PM   #4
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Allow me to correct myself... Tuning will be between 25 and 35 hertz...
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Old 1st July 2005, 07:42 AM   #5
Collo is offline Collo  Australia
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I recently surveyed different driver sizes on the net and using the WinISD database.

Taking the average of the figures, an 18 inch driver is 6.5 litres

the full set:

08 inch 1.0 litre
10 inch 1.5 litre
12 inch 2.5 litre
15 inch 4.0 litre
18 inch 6.5 litre

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Old 2nd July 2005, 05:52 AM   #6
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It's on their website as 6.5L if I recall correctly. Check the archive version! There is a link in their new site.
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Old 4th July 2005, 01:41 PM   #7
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displacement of the driver not sweep displacement.

i used 0.3cuft for my calulation, if it is smaller then i just got tuned a little lower.

as per chad kuypers

"6 cubic feet @30Hz is about the starting point for the 18. Any larger and you dont gain much loudness just a little bit more bottom end. I know a guy that did 4.5cuft @30Hz and it was insanely loud"

as per guy with 4.5@30Hz
"it was insanely loud. it was great for music but lacked a little in the infrabass frequincies for movies and what not"

im doing 6cuft@28Hz in an extended cab B3000.

wangtastic they started shipping wednesday the 29th (i think the 29th) and if it hasnt shipped yet it will tuesday the 5th of july...or should. there is a message about it if yo ucall ascendant (recorded).
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Old 4th July 2005, 02:28 PM   #8
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oooops!

in that case, you can make a rough estimate looking at its dimensions, certainly as accurate as you are going to need.
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