2 D2 gimballed beams on the outside hardpoints and 2 D2 gimballed cannons on the nose hardpoints with the B 4 gimballed cannon is lethal within 500 meters. You do have to be such a good shot at firing with just one large cannon or one large PA, granted the PA projectile does fly faster but load slower. My hits with all 3 cannons range from 25 to 35% hull damage and the main advantage the B 4 cannon has over the PA is the ''heat buildup'', it means you have 0.3 seconds to take that shot between the next with the PA but after 2 or 3 shots you need to use a heatsink or your ship overheats, with the triple-cannon setup I have never used heatsinks for anything other than the 2 beams which can fire for ages on an A 6 power distributor.
So the triple cannon setup for big ships, or my all time favorite....4 Gimballed multi-cannons and 1 C 3 gimballed beam on the huge belly hard-point, once that shield is down...bye bye hull.
I do love the PA and it's sound but it really is a big ship weapon especially since it is only available as fixed, not all us CMR's are young sprites with reflexes of steel...more like reflexes of cheese with me I know that.