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Chicago wrote:
 Ok here goes Does a IB have to be 4 Subs |
No an IB doesn't have to be 4 subs. The problem is that since there is not cabinet acting on the back side of the sub, there is very little to resist its motion. Because of that, it doesn't take much power to push an IB sub to it's excursion limits and therefore the volume output is limited. The common way to get more volume if you cannot apply more power is to add more drivers.
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Chicago wrote:
Next what determines what makes a SUB a IB sub? |
I believe you mean what makes a particular driver suitable for IB use. Since the only resistance to motion in an IB is it's own mechanical resistance (spider, mass, and surround), IB drivers have different values than drivers intended to be in a cabinet. Also, IB drivers don't require much power to reach their excursion limits, so the motor structure is generally not a large, powerful motor. Start a dialogue with the guys over at Fi for more design specifics.
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Chicago wrote:
Also how do you find out what the VAS is on a sub?. |
When you buy a driver, the manufacturer will list its T/S parameters. When you buy an already built subwoofer, there isn't any way to find info on the driver unless it is sold independantly on the market. There is also a do-dad from
partsexpress that will measure the T/S parameters of any driver.
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Chicago wrote:
How do you determine to point sub in or out ?(some are in and out ) |
I don't think it matters, but someone else may know better.
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Chicago wrote:
I have a Cerwin Vega 15 was wondering if i could at least try this sub to see the type of sound i could possibly get,(Anyone know the VAS to this sub?) |
No one can tell you what to do, but you are risking the health of that driver and ruining an already fantastic sub.
What does VAS mean. Don't know for sure...I would guess Volume of Air Suspension. From wikipedia "It represents the volume of air that has the same stiffness as the driver's suspension when acted on by a piston of the same area (Sd) as the cone"