2 Ion cannons - average reach, power and fire rate.
1 Blaster cannon - average reach, power and fire rate.
Compared to the "Efa", the "Zeta" is 30% bigger, 50% more expensive, 20% slower with weaker shield and more powerfull hull armor. The ion cannons are symmetrically placed near the ship's front, while the blaster cannon is more close to the ship's back.
translated by ~shinigami195