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Message: <blockquote data-quote="betteraudio" data-source="post: 6383529" data-attributes="member: 615484">Alright, well let's start with how to wire the subs. That is going to depend on what amp you are using, and to what impedance it is stable, how much power it produces into each load it is capable of driving, and the power handling capabilities of your driver/enclosure combination. I say combination because how you tune your box can dramatically effect the excursion produced by a given level of input power.What we know so far is that you have 2 woofers, each with dual 2-ohm voice coils. You have 2 options for each sub. Wire the coils in parallel for a 1 ohm load, or in series for a 4 ohm load.You can then wire the two woofers together in series for either a 2 ohm load or an 8 ohm load, or in parallel for either a 0.5 ohm or a 2 ohm load.If you are using one amp, you will want to wire the voice coils in series and then wire the subs together in parallel, which will give you a final impedance of 2 ohms.You could accomplish the same load by wiring the coils in parallel and then wiring the subs in series, but wiring dual voice coils in series doubles the BL of the driver, which is desireable.If you were to wire all the coils together in parallel, you'd have a 0.5 ohm load, which most amplifiers would not be able to handle.Now on the other hand, if you are going to use two amplifiers, you can wire each sub's coils in parallel for a 1-ohm load, provided both amps are stable to 1 ohm, which is much more common than 0.5 ohms stability.As for the box, it looks like the manufacturer gave you a good idea of what ranges you should be looking at. If you are looking for maximum low end hard hitting bass, I would say go with at least 2.5cf per sub, and tune at 28Hz.I would get yourself a copy of <a href="http://www.linearteam.org" target="_blank">WinISD</a> and plug the driver and enclosure parameters into it and then tell it how much power you're going to be giving it in the signal tab.Once you've done that, you'll be able to go to the Rear Port Air Velocity plot, and see how fast the air will be moving in whatever port dimensions you enter in the Vents tab of the design window.Anything over 17 meters/second is likely to result in port noise, so you'll want to use however large a port area is required to keep velocity below 17m/s. It will tell you the length required for a port of those dimensions.Just remember to calculate the displacement of the port (it will be significant) and add that to the volume you specified in the Box tab, along with whatever the woofers will displace, to know how big to build the enclosure.</blockquote>

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