Like its predecessors, the Poseidon also has an open-back design and is still equipped with a 50mm dynamic driver made of nickel.
While Beryllium as a dynamic driver material has been lauded for its stiffness and high fidelity reproduction of audio, HarmonicDyne has found that purified laboratory-grade Nickel is a stiffer and more responsive diaphragm material. This results in greater clarity and articulation with reduced distortion in the low frequencies.
The 50mm driver size allows the Poseidon to still have rigidity while remaining large enough to produce authoritative bass reaching down to 10Hz. This results in an experience similar to having a subwoofer in the room.