Aeon 4
Grado Aeon4 – Precision and Musicality from the Lineage Series
Aeon4 sits within the Grado Lineage Series as a direct expression of the design principles that define the line. Developed through decades of cartridge refinement, it delivers a highly resolved and controlled presentation while maintaining the musical balance that defines Grado cartridges.
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Performance
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.
Flux-Bridger Moving Iron Design
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.
Diamond & Cantilever
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.
Coil & Internal Structure
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.
Housing
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.
Specs
- Body – Brazilian Ebony Wood
- Cantilever – Sapphire/Shibata Diamond
- Output – 1.0mV @ 5 CMV (45 degrees)
- Controlled Frequency Response – 5 Hz – 70 KHz
- Channel Separation – Avg. 30db, 10-30K Hz
- Input Load – 10-47k ohms
- Inductance – 8mH
- Resistance – 74 ohms
- Cartridge Weight – 10.5 grams
- Tracking Force – 1.6-1.9 grams
- Compliance – 20 μm/mN
