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DVC's allow flexibility. Lets say you have a single sub... that is a DVC (4 Ohm per coil). You can wire them in series for an 8 Ohm load. You can wire them in parallel for a 2 Ohm load. Why do you want either a 2 or 8 ohm load? Well that depends on your amp.

Most standard class AB amps are stable into 2 ohms or greater. Most people want to bridge a 2-channel amp to a single sub. BUT... when you bridge an amp (most that is) the amp actually sees 1/2 the impedance and usually doubles the power.

For example... bridge a 2 channel 2x50W (at 4 Ohms) amp onto a 4 Ohm sub and the amp thinks it's really a 2 Ohm sub. Typically power doubles every time you cut the impedance in half. So instead of getting 100W you actually get 200W to the sub. Any lower impedances and the amp will probably shut down from overheating.. or you may pop a fuse.

Now.. if you are looking for big SPL and are considering a class-D or other "competiton" amp which are really designed for ultra low impedences... then by wiring your voice coils in parallel and dropping the impedance you get big power numbers.

Hope that made sense...

Feel free to ask more.
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