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I had a question about subwoofers. I'm not sure if it was answered before or not - I did a search and didn't find a direct answer. Anyway - I was just wondering what difference between a single coil and double coil sub was. Also - what is the difference between the amount of ohms for a sub. How do they affect the sound? Thanks in advance!

 
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the difference between single and dual voice coils is that a dual one acts as two subs. You have two + terminals on the sub, and two - terminals. I don't know what the benefit of this is, but that's the difference. It has to do with ohms also...

Ohms are the resistance of the sub. More or less how much power do you have to give it. The connection between voice coils and ohms is that you can wire a dual voice coil sub to itself. Wire the + terminal on one voice coil to the - terminal on the other voice coil (same sub). This will turn a 4 ohm dual voice coil sub into, effectively, an 8 ohm single voice coil sub (I think its 8 ohm; it might be 2 ohm though. Don't take my word for it).

 
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Basically DVC subs have two hookups vs SVC subs have one hookup. The advantage is simply for wiring purposes.

A SVC 4 ohm sub can only be 4 ohms. A DVC 4 ohm sub can be treated as two 4 ohm subs (powering both coils is required anyway), one 8 ohm sub (series wiring), or a 2 ohm sub (parallel wiring).

Think of it as a SVC 4 ohm sub has one 400 watt, 4 ohm coil to power, while a DVC 4 ohm sub, has two 200 watt coils to power.

As far as sound, there is no difference.

Also think about the amp its hooking to, say a 100x1 @ 4 ohms, 200x1 @ 2 ohms.
With the subs above, the SVC 4 ohm sub would get 100 watts, while the DVC 4 ohm sub version wired in parallel at 2 ohms would get 200 watts (100 watts per coil). Obviously the DVC one is a better choice since it gets the amp to put out more power.