Aeon4 is a low output moving iron cartridge designed for use with high-gain phono stages.

Its presentation is defined by clarity, control, and balance. Detail is presented with precision while maintaining a smooth and composed top end. The midrange carries natural weight and presence, and low frequencies are delivered with definition and authority.

Complex passages are resolved cleanly, with strong separation and stable imaging. The overall presentation remains composed and coherent, allowing the structure and character of the recording to come through.

All Grado cartridges utilize a moving iron design built on Joseph Grado’s patented flux-bridger principle.

This approach allows the cartridge to generate a precise signal with extremely low moving mass, while keeping the coil structure fixed. The result is a presentation that combines speed, control, and harmonic integrity without the fragility often associated with traditional moving coil systems.

The design also ensures long-term consistency, maintaining performance over time without degradation of the internal signal path.

Aeon4 features a nude Shibata diamond mounted to a sapphire cantilever.

The Shibata profile is highly effective at retrieving detail from the groove, offering exceptional contact and resolution while maintaining a natural, unforced presentation. Paired with a sapphire cantilever—known for its rigidity and resistance to deformation—the system delivers clarity, extension, and stability across the frequency range.

The internal signal path is built using ultra-high purity 7N OCC copper, selected for its conductivity and consistency.

Each cartridge undergoes cryogenic treatment during both component preparation and final assembly, helping to stabilize materials and optimize performance.

The internal structure is carefully damped to reduce unwanted resonance and vibration, allowing the cartridge to extract information from the groove with minimal interference. The result is a signal that remains coherent, balanced, and dynamically responsive.

The Aeon4 is housed in a Brazilian Ebony wood body.

Beyond its visual presence, the wood plays a role in controlling resonance and contributing to the cartridge’s tonal balance. The structure has been refined to reduce mass while improving compatibility across a wider range of tonearms.

The form also improves visibility of the cantilever during setup, allowing for more precise alignment.