uklit
New Member
Posts: 9
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Post by uklit on Jun 18, 2009 4:48:16 GMT -7
Incriminator Audio is introducing a new 21 inch IB sub. Preliminary specs are:
Fs: 24 Hz
Re 3 Ohm Series
Qms: 8.01
Qes: 0.73
Qts: 0.67
Mms: 419 g
Cms 0.10 mm/N
Vas: 372 L
Sd: 1620 cm^2
BL: 15.4
Xmax: 33mm
Xmech: 42mm
SPL: 90.5 1w/1m
1500 RMS
VD is 10560 cm^2.
The owner is looking for feedback. There's a thread at the Shack if anyone is interested.
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Post by ThomasW on Jun 18, 2009 7:39:37 GMT -7
Yeap saw that announcement. Thing is a pair of Fi 18"s move 40% more air for the same cost. People don't understand how unwieldy drivers that large are. Also there are potential issues for the suspension to sag and the cone to have break up issues given the size and weight (419g Mms) of the moving mass. I know Fi and Exodus are also going to make drivers this large. People are jazzed about these monster drivers; but I think once the initial hype has subsided, there will be limited demand for these drivers given the practical considerations involved with their installation and cost. Of course I could be wrong, that's happened on more than one occasion....  |
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Post by robfive on Jun 21, 2009 15:48:42 GMT -7
I understand the problems associated with going to larger and larger diameter drivers regarding the increased cone weight, surround limitations, suspension issues, etc. My question is "are 18" drivers pushing the envelope also?" I am looking at two 18" Fi drivers over four 15" Fi drivers. The 18"s would cost less, offer slightly more output, and would ease the task of up-grading  . I will go with 15s if they offer better longevity. |
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Post by ThomasW on Jun 22, 2009 9:55:17 GMT -7
We know 18"s work just fine.
A 21"-22" sub is IMO a different animal...
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Post by robfive on Jun 22, 2009 14:30:05 GMT -7
Cool. Thanks for your input.  |
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toxis
New Member
Posts: 8
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Post by toxis on Mar 11, 2010 15:59:35 GMT -7
so while we say that we know the 18" FI's work well in IB, but are they honestly as responsive and clean as the 15's? Typically when you go from a 15 to a 12 or to a 10, any smaller driver from a larger, you get tighter and more responsive sound so is this not true going IB? Or is it so minimal that it's rarely an issue?
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Post by ThomasW on Mar 11, 2010 16:42:32 GMT -7
Typically when you go from a 15 to a 12 or to a 10, any smaller driver from a larger, you get tighter and more responsive sound so is this not true going IB? Smaller drivers = fast bass is a myth |
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toxis
New Member
Posts: 8
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Post by toxis on Mar 11, 2010 21:20:57 GMT -7
can you elaborate? I only ask because I have yet to have this proven wrong even when looking at the same speakers just different sizes. Home, car, pro... all the same conclusion. I'm all ears!
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Post by rlj5242 on Mar 18, 2010 13:32:28 GMT -7
can you elaborate? I only ask because I have yet to have this proven wrong even when looking at the same speakers just different sizes. Home, car, pro... all the same conclusion. I'm all ears! Dan Wiggins wrote a great paper on it a few years ago - www.stereointegrity.com/docs/WooferSpeed.pdf |
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jcnes
New Member
Posts: 23
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Post by jcnes on Mar 19, 2010 6:38:32 GMT -7
Not to muddy the waters, but wouldn't a bigger driver (with more sd) be more responsive and have better transient response at bass frequencies than a smaller driver? Seems the more surface area you have, the less cones will have to move, therefore "faster" bass. A driver with an sd of 1200cm^2 would only have to move 1mm for every 3mm that a driver with an sd of 400cm^2 would. I actually have no idea if this is true or not, but I've operated under this assumption, so I'd be glad to be proven wrong |
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