Grado
Timbre Series Opus4 Phono Cartridge
$300.00 USDFeatures
American Maple wood body selected for natural resonance control and tonal balance
Moving iron flux-bridger design delivers low moving mass, speed, and long-term reliability
Bonded elliptical diamond on an aluminum cantilever for precise groove contact and faithful tracking
Internal coil wound with ultra-high purity 5N OCC copper for conductivity and signal consistency
Cryogenically treated with internal damping to minimize unwanted resonance
Available in high output, low output, and mono configurations for broad phono stage compatibility
Extended frequency response of 10–60 kHz
Non-sensitive to capacitive load for flexible system matching
Eligible for the Grado Wood Cartridge Upgrade Program
What's in the Box?
Warranty
Opus4 is the entry point into the Grado Timbre Series, introducing the tonal character and construction of Grado's wood body cartridges. Built on decades of cartridge design experience, it delivers a balanced and musical presentation while maintaining the core performance principles that define Grado cartridges.
Utilizing Grado's moving iron design, Opus4 provides a stable and consistent signal with low moving mass and long-term reliability.
Offered in both stereo and mono configurations, Opus4 represents the foundation of the Grado wood cartridge line.
Performance:
Opus4 is available in both high and low output configurations, allowing for compatibility across a wide range of phono stages.
Its presentation is balanced and controlled, with clear detail and a smooth, natural top end. The midrange carries presence and warmth, while low frequencies remain defined and composed.
Recordings are presented with stability and coherence, maintaining separation and musical flow while allowing the character of the recording to come through naturally.
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.
Diamond & Cantilever:
Opus4 features a bonded elliptical diamond mounted to an aluminum cantilever.
The elliptical profile provides effective groove contact and reliable tracking, while the aluminum cantilever contributes to a stable and controlled presentation. This combination delivers clarity and balance across a wide range of recordings.
Housing:
The Opus4 is housed in an American Maple wood body, selected for its ability to help control resonance and contribute to the cartridge's tonal balance. The structure supports stable playback and consistent performance across a wide range of tonearms.
| Parameter | Specification |
|---|---|
| Physical Specifications | |
| Body | American Maple Wood |
| Cantilever | Aluminum / Bonded Elliptical Diamond |
| Cartridge Weight | 8.3g |
| Electrical Specifications | |
| Output (High) | 4.0mV @ 5cm/s (45°) |
| Output (Low) | 1.0mV @ 5cm/s (45°) |
| Inductance (High Output) | 55mH |
| Inductance (Low Output) | 6mH |
| Resistance (High Output) | 660 ohms |
| Resistance (Low Output) | 70 ohms |
| Input Load | 10k–47k ohms |
| Audio Specifications | |
| Frequency Response | 10Hz – 60kHz |
| Channel Separation | Average 30dB (10–30kHz) |
| Performance Specifications | |
| Tracking Force | 1.6–1.9g |
| Compliance | 20μm/mN |
| Additional Information | |
| Available Builds | High Output Low Output Mono High Output Mono Low Output |