I haven't run any of my sub's in the same box but they're definitely built beefier. The v2s and 3s are rated at 500. There's not a ton of difference between the 2 and 3, just some changes to make them more rugged and more linear.
I also can't really compare my v2 to 2 v3s. I've bought all yard sale sub's and have not been disappointed
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