Epoch 4

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Grado Epoch4 – The Pinnacle of the Lineage Series
Epoch4 represents the highest level of performance within the Grado Lineage Series. Developed through decades of cartridge design and refinement, it reflects a continuous pursuit of musical accuracy, control, and resolution.

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Performance

Epoch4 is a low output moving iron cartridge designed for use with high-gain phono stages.

  • Its presentation is defined by clarity, separation, and control.
  • Detail is revealed without exaggeration, with a top end that remains smooth and composed.
  • The midrange carries natural weight and texture, while low frequencies are delivered with authority and precision.
  • Complex recordings are resolved with ease, maintaining separation and spatial accuracy without collapsing the soundstage.
  • The overall balance allows the character of the recording to come through naturally.

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

Epoch4 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 OCC copper with gold plating, chosen for its conductivity and long-term reliability.

  • 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 Epoch4 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 – 75 KHz
    • Channel Separation – Avg. 30db, 10-30K Hz
    • Input Load – 10-47k ohms
    • Inductance – 8mH
    • Resistance – 95 ohms
    • Cartridge Weight – 10.5 grams
    • Tracking Force – 1.6-1.9 grams
    • Compliance – 20 μm/mN

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