Driver w/Goofy Parameters. What to Build With It? - Page 2 - diyAudio
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Old 19th October 2006, 05:05 PM   #11
Did it Himself
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A quick play reveals that it's not physically possible to implement a vent in a suitable box size. A passive radiator or method to increase Qts (and hence box size) will have to be employed.
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Old 19th October 2006, 05:46 PM   #12
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Default Cant find mfg info...

is this a dual coil driver? If so you can run just one coil to raise Qts. You might ask Scottmoose to run a sim for you to see if this driver would work in a BIB cabinet. That's about all I can suggest. Good luck regards Moray James.
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Old 19th October 2006, 09:23 PM   #13
Ron101 is offline Ron101  Canada
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Nope single voice coil... Told ya this thing was goofy. Designer must have partied hard during development.

Thx, I'll do some reading on passive radiators.
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Old 19th October 2006, 11:37 PM   #14
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Default Damn the box size...

Design a vented box design and let the vent be external to the small box. That will work for you as long as you don't mind what it looks like.
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Old 20th October 2006, 12:08 AM   #15
Variac is offline Variac  United States
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You can make it look like a submarine or giraffe
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Old 20th October 2006, 10:05 AM   #16
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Default Sub resonance box...

just had a look at the Australian site ESP where they run the driver in a very small box to force resonance way up then use a simple EQ to set things staight adjusting for the 12 db per octave roll off. Might be worth looking into for this driver as you loose the big vent pipe and keep it all small.
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Old 20th October 2006, 10:36 AM   #17
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IMO this approach is not suitable because Qts is just so low - the speaker is optimised for vented use. You will need an impractical amount to boost to get any bass, and the box will be stupidly small, like 3 litres or something.
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Old 20th October 2006, 12:08 PM   #18
sreten is offline sreten  United Kingdom
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Hi,

ESP details a variable output impedance amplifier, this could be
used with a positive output impedance to increase effective Qts.

(Really just another way of EQ'ing)

/sreten.
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Old 20th October 2006, 07:47 PM   #19
Ron101 is offline Ron101  Canada
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Default Re: Sub resonance box...

Quote:
Originally posted by moray james
just had a look at the Australian site ESP where they run the driver in a very small box to force resonance way up then use a simple EQ to set things staight adjusting for the 12 db per octave roll off. Might be worth looking into for this driver as you loose the big vent pipe and keep it all small.
Would there be significant risk of overheating with such a small air volume?
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Old 20th October 2006, 09:36 PM   #20
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Default I kind of doubt it...

these drivers get stuck in car trunks in black cars in the summer sun and have the you know what beat out of them and they have to survive all that. I also doubt that you would have to put more tha a couple of hundred watts into one for peaks. I really don't think that overheating would be a problem. If you really had concerns you could always build in a heat sink but that sounds a bit extreem to me.
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