| I have both of these heads, I think the 6 has a bit more crunch than the 3, and definitely gets louder... but to be honest, I am very happy with the sound from both of them.
The funny thing I always find is people complaining about how the 3 is too quiet... I have never had that problem, in fact, the 3 gets plenty loud for anything that I've ever done...
-J
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