The Story
Grado Timbre Series
Opus4
The foundation of Grado's wood body cartridge line — balanced, musical, and built on decades of moving iron expertise.
Moving Iron Design
Flux-bridger principle for low moving mass and long-term reliability
Elliptical Diamond
Bonded elliptical diamond on aluminum cantilever for reliable tracking
American Maple Body
Wood housing selected for resonance control and tonal balance
5N OCC Copper
Ultra-high purity coil winding with cryogenic treatment
Performance
Opus4 delivers a balanced and controlled presentation — clear detail, a smooth natural top end, and a midrange that carries genuine presence and warmth. Low frequencies remain defined and composed without overhang.
Recordings are presented with stability and coherence, maintaining separation and musical flow while allowing the character of the source to come through naturally. Available in both high and low output configurations for broad phono stage compatibility.
Specifications
Construction
Body
American Maple Wood
Cantilever / Stylus
Aluminum / Elliptical Diamond
Cartridge Weight
8.3 grams
Output & Electrical
Output — High
4.0 mV @ 5 cm/s (45)
Output — Low
1.0 mV @ 5 cm/s (45)
Inductance — High
55 mH
Inductance — Low
6 mH
Resistance — High
660 ohms
Resistance — Low
70 ohms
Input Load
10k – 47k ohms
Capacitive Load
Non-Sensitive
Tracking & Response
Tracking Force
1.6 – 1.9 grams
Compliance
20 μm/mN
Channel Separation
Avg. 30 dB (10 – 30k Hz)
Frequency Response
10 – 60 kHz (controlled)
The Grado Moving Iron Advantage
All Grado cartridges are built on Joseph Grado's patented flux-bridger principle — a moving iron design that keeps the coil structure fixed while the iron element moves. The result is extremely low moving mass, a precise signal path, and a presentation that combines speed, control, and harmonic integrity without the fragility often associated with traditional moving coil systems.
Available Builds
High Output
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Description
Grado Timbre Series
Opus4
The foundation of Grado's wood body cartridge line — balanced, musical, and built on decades of moving iron expertise.
Moving Iron Design
Flux-bridger principle for low moving mass and long-term reliability
Elliptical Diamond
Bonded elliptical diamond on aluminum cantilever for reliable tracking
American Maple Body
Wood housing selected for resonance control and tonal balance
5N OCC Copper
Ultra-high purity coil winding with cryogenic treatment
Performance
Opus4 delivers a balanced and controlled presentation — clear detail, a smooth natural top end, and a midrange that carries genuine presence and warmth. Low frequencies remain defined and composed without overhang.
Recordings are presented with stability and coherence, maintaining separation and musical flow while allowing the character of the source to come through naturally. Available in both high and low output configurations for broad phono stage compatibility.
Specifications
Construction
Body
American Maple Wood
Cantilever / Stylus
Aluminum / Elliptical Diamond
Cartridge Weight
8.3 grams
Output & Electrical
Output — High
4.0 mV @ 5 cm/s (45)
Output — Low
1.0 mV @ 5 cm/s (45)
Inductance — High
55 mH
Inductance — Low
6 mH
Resistance — High
660 ohms
Resistance — Low
70 ohms
Input Load
10k – 47k ohms
Capacitive Load
Non-Sensitive
Tracking & Response
Tracking Force
1.6 – 1.9 grams
Compliance
20 μm/mN
Channel Separation
Avg. 30 dB (10 – 30k Hz)
Frequency Response
10 – 60 kHz (controlled)
The Grado Moving Iron Advantage
All Grado cartridges are built on Joseph Grado's patented flux-bridger principle — a moving iron design that keeps the coil structure fixed while the iron element moves. The result is extremely low moving mass, a precise signal path, and a presentation that combines speed, control, and harmonic integrity without the fragility often associated with traditional moving coil systems.
Available Builds
High Output
