RE SX 15" in 2.8box?

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95Honda
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Postby 95Honda » Wed Jul 16, 2008 1:47 am

Manufacturers reccomendations don't need to be set in stone.

Gernerally, the higher efficiency drivers have higher Vas, and those to are directly proportional. ANd a higher Vas mean a larger box for a given target response.
http://www.forceaudio.com

Marshall asked me how much it would be to fly to Idaho....
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KU40
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Postby KU40 » Wed Jul 16, 2008 6:42 am

I just looked at the winISD transfer function magnitude graph. the response is flat from 35 hz and up in that enclosure.
-Nick aka NS1 aka mopey aka speedbump
Alpine CDA-9827
Crossfire CFQ5.2
JL Audio XR 650csi components, Planet Audio TT2300
Crossfire VR404 on factory rear 6x8's until I get them upgraded
SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)
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KU40
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Postby KU40 » Wed Jul 16, 2008 6:46 am

95Honda wrote:Manufacturers reccomendations don't need to be set in stone.

Gernerally, the higher efficiency drivers have higher Vas, and those to are directly proportional. ANd a higher Vas mean a larger box for a given target response.


I know I've seen the efficiency equation somewhere. Doesn't it also have fs in it, with the relationship being a lower fs not only lowers efficiency but also increases box size? Maybe I'm wrong on the second part. But the tradeoff is that a lower fs helps it play lower.
-Nick aka NS1 aka mopey aka speedbump

Alpine CDA-9827

Crossfire CFQ5.2

JL Audio XR 650csi components, Planet Audio TT2300

Crossfire VR404 on factory rear 6x8's until I get them upgraded

SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)
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Chiney
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Postby Chiney » Wed Jul 16, 2008 9:38 pm


I just looked at the winISD transfer function magnitude graph. the response is flat from 35 hz and up in that enclosure.


wat exactly does that mean? is that good or bad? :cwm16:
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95Honda
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Postby 95Honda » Thu Jul 17, 2008 12:30 am

good.
http://www.forceaudio.com



Marshall asked me how much it would be to fly to Idaho....
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Chiney
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Postby Chiney » Thu Jul 17, 2008 4:46 am

well.. 3.0cuft @ 32hz it is .. thx a lot guys! awesome help.. will post pics when finished!
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KU40
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Postby KU40 » Thu Jul 17, 2008 6:44 am

It just means that the box itself won't create a peaky response. Many ported boxes have a hump of increased output just above tuning. That means that, say, 38 hz would be louder than 60 hz. Of course your vehicle will alter the response due to its cabin properties and how they affect sound, but at least you won't be going into the situation with an already peaky enclosure.
-Nick aka NS1 aka mopey aka speedbump

Alpine CDA-9827

Crossfire CFQ5.2

JL Audio XR 650csi components, Planet Audio TT2300

Crossfire VR404 on factory rear 6x8's until I get them upgraded

SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)

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