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Lt. Commander
Join Date: Dec 2007
Posts: 120
# 2
01-30-2010, 07:11 PM
Heavy Cannons have a longer cool down but do more damage.

Generally Dual Cannons are good if you have 3 front slots (2 Duals and a Torp) since you can chain a max of 2 Dual Cannons while Heavy Cannons come into their own when you have 4 Front slots since you can chain 3 of them (so 3 Heavy Cannons and a Torp)