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The Vas for the Shiva's on the Adire webpage says 151 liters, that's 5.33ft^3 !! Seems a little high? Is it supposed to be 15.1 liters? If that is correct then this speakers are designed for a huge amount of space.
-------------------- Red 96' A4 Firebird Adire Audio and Autotek Visit my page! Posts: 99 | From: Florida | Registered: Nov 2001
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5 cu ft isn't high at all. around 8-9 would be. Then again, vas does not tell you how big the box will be. In conjunction with qts, you can figure out box size. high qts, around .6 and high vas means a VERY large box. smaller values of qts for the same vas give smaller boxes. A qts of .2 would yield a box MUCH smaller than a qts of .6.
Posts: 768 | From: Ottawa, On, Canada | Registered: May 2000
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I see... what about the CV Stroker? It has a Vas of .78ft^3 and a Qts of 0.237. Now that's small! Question: why is the Fs (51Hz) so high? Seems odd?
-------------------- Red 96' A4 Firebird Adire Audio and Autotek Visit my page! Posts: 99 | From: Florida | Registered: Nov 2001
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A vas of .78 for a cv stroker sounds off. I think it's 7.8.
If fs is high, effeciency will also go up. High vas, high fs mean a good effeciency, enter the stroker and dd subs. Unfortuantely, with a high fs, it won't play as low. But to know how low, you need to look at fs and qts. Again, higher values of qts will play down closer to fs. As where lower values of qts will drop off in response much sooner(higher freq) than higher qts values.
Something to try. Download winISD and input three drivers having all the same specs but change qts for one of them, vas for another and fs for the other. This will let you see better what's happening.
Posts: 768 | From: Ottawa, On, Canada | Registered: May 2000
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most of your high Q subs are designed to be boomy in small boxes. The reason alot of subs with small motors and loose suspensions(high vas) are usually put into small sealed boxes to help control the movement of the cone.
Since most of these subs can't handle alot of input power(suspension or coil limits) they are put into a catagory called SQ. This isn't a problem unless the sub has a very low Fs due to high moving mass(mms.) In this case the sub sounds muddy and very boomy and is anything but SQ.
just my .02 on how alot of mass marketing subs are built and sold.
this is not directed at any one line of subs please looks at ALL the specs and make your own conclusions.
-------------------- ---Member of Team Gates--- Don't knock it, if you know nothing about it.
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