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Old 5th June 2007, 03:45 PM   #1
Phobos is offline Phobos  Italy
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Question what unit for a ELF sub?

Hi, I'm thinking about building a sub in the smallest possible enclosure and i stumbled on this: ELF Subwoofer.
Basically, a sub unit (or more) ar put in a very small enclossure so that the resonant frequency is driven up over the crossover point.
Then the sub is equalized using a Linkwitz transform circuit.
This kind of projec requires LOTS of power (~250 W per driver at medium efficiency) and a unit that is capable of low distortions and good excursions.
I was thinking that a PA oriented sub would be ideal for this kind of project because they tend to be:
a) able to withstand abuse and come back asking for more.
b) very efficient, wich helps reducing power requirements.
I was thinking about 12" (maybe 2 units) or 15" (only one, cause it would be too big).
So, what units would you use for this project?
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Old 5th June 2007, 04:02 PM   #2
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A linkwitz Transform is not used for this application, the double-integrator is, it's all in the article. It is possible to use a Linkwitz Transform, but you would not do it quite this way.

A PA driver would not be ideal for this as they have low Xmax and high Fs. There are dedicated sub-woofer drivers on the market that would be better choices.
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Old 5th June 2007, 04:13 PM   #3
Phobos is offline Phobos  Italy
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Yeah, I saw a lot of PA woofers that have low xmax and high fs but i thought that SUBwoofers for PA use would have higher xmax and lower fs.
Anyway my question was what would YOU use, meaning that i'm open to any kind of suggestion.
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Old 5th June 2007, 04:16 PM   #4
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I used one of these http://www.shadowworks.co.uk/SW/HTML...ts/genesis.htm
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Old 5th June 2007, 04:51 PM   #5
Phobos is offline Phobos  Italy
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Thx man the specs for those subs are incredible at that price range! What kind of enclosure did you build for your genesis?
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Old 5th June 2007, 06:56 PM   #6
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Approx 40 litres sealed, with a Linkwitz Transform. They are truly excellent drive units, and priced competitively.
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