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[Tim McCulloch]

This.

We have been running 4 conductors on subs for years so that each driver gets powered discretely. The benefit gets better when you have multiple dual 18's and you never know how many you are going to use that day. If you out out 3/side with the standard wiring you'll have a 2 ohm load and a 4 ohm load, but with the discrete wiring both loads would be 2.6 ohm. You'll get a balanced load on your amp (and distro, depending how its wired) by using the discrete wiring.

You also double the damping factor by halving the cable resistance and doubling the load impedance by driving the subs as "8" Ohm loads instead of "4" Ohm loads.

[Jared Bartimus]

This.

We have been running 4 conductors on subs for years so that each driver gets powered discretely. The benefit gets better when you have multiple dual 18's and you never know how many you are going to use that day. If you out out 3/side with the standard wiring you'll have a 2 ohm load and a 4 ohm load, but with the discrete wiring both loads would be 2.6 ohm. You'll get a balanced load on your amp (and distro, depending how its wired) by using the discrete wiring.

Are there any risks if only one driver gets disconnected/has amp problems?

[Tim Weaver]

Are there any risks if only one driver gets disconnected/has amp problems?

Yes and no.

The amp doesn't care. But if you are really abusing your subs you might blow the one that is connected because it is both trying to make noise AND flopping the unconnected one around in the cabinet which sucks power and volume. If you keep pushing it, you'll fry the voice coil or just rip a cone.

[Mike Caldwell]

Yes and no.

The amp doesn't care. But if you are really abusing your subs you might blow the one that is connected because it is both trying to make noise AND flopping the unconnected one around in the cabinet which sucks power and volume. If you keep pushing it, you'll fry the voice coil or just rip a cone.

No real difference than in a dual woofer sub with parallel wired drivers and if one blows.
Some subs are dual chamber so it would not unload if one driver blows.

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