Grado Prestige Red4 MI Cartridge 4.0mV (Standard Mount)

In Stock	An In Stock item is available to ship normally within 24 business hours.
Preorder	A Preorder is an item that has not yet been released. Typically the label will set a projected release date (that is subject to change). If a projected release date is known, we will include this in the description in red. Other Preorders are set to release 'TBA.' This means that release date is yet 'To Be Announced'. The Preorder can be released anywhere between weeks, months or years from its initial announcement.
Backordered	An Out Of Stock item is an item that we normally have available to ship but we are temporarily out of. We do not have a specific date when it will be coming.
Awaiting Repress	Awaiting repress titles are in the process of being repressed by the label. No ETA is available at this time.
Expected On	When an item is Out Of Stock and we have an estimated date when our stock should arrive, we list that date on our website in the part's description. It is not guaranteed.
Special Order	A Special Order item is an item that we do not stock but can order from the manufacturer. Typical order times are located within the product description.

In Stock

An In Stock item is available to ship normally within 24 business hours.

Preorder

A Preorder is an item that has not yet been released. Typically the label will set a projected release date (that is subject to change). If a projected release date is known, we will include this in the description in red. Other Preorders are set to release 'TBA.' This means that release date is yet 'To Be Announced'. The Preorder can be released anywhere between weeks, months or years from its initial announcement.

Backordered

An Out Of Stock item is an item that we normally have available to ship but we are temporarily out of. We do not have a specific date when it will be coming.

Awaiting Repress

Awaiting repress titles are in the process of being repressed by the label. No ETA is available at this time.

Expected On

When an item is Out Of Stock and we have an estimated date when our stock should arrive, we list that date on our website in the part's description. It is not guaranteed.

Special Order

A Special Order item is an item that we do not stock but can order from the manufacturer. Typical order times are located within the product description.

Description

This product can only be shipped to U.S. addresses.

Red4 is part of the Grado Prestige Series, delivering a balanced and engaging presentation built on decades of cartridge design experience. It maintains the core performance principles that define Grado cartridges while offering broad system compatibility.

Utilizing Grado's moving iron design, Red4 provides a stable and consistent signal with low moving mass and long-term reliability. The die-injection molded housing supports consistent construction and dependable performance.

Offered in both standard mount and P-mount configurations, Red4 is designed for a wide range of systems.

Performance

Red4 is a high output moving iron cartridge designed for compatibility with 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 body, while low frequencies remain defined and composed.

Recordings are presented with stability and coherence, maintaining separation and imaging while allowing the character of the music to come through naturally.

Diamond, Cantilever & Stylus

Red4 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 balanced presentation. This combination delivers consistent performance across a wide range of recordings.

The stylus assembly is user-replaceable, allowing for easy maintenance and long-term ownership. All Prestige Series styli are interchangeable, providing flexibility across models while maintaining consistent performance.

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.

Coil & Internal Structure

The internal signal path is built using ultra-high purity 5N OCC copper, selected for its conductivity and consistency.

Each cartridge undergoes cryogenic treatment and internal damping to reduce unwanted resonance and preserve signal integrity. The result is a presentation that remains coherent, balanced, and dynamically responsive.

Technical Specifications

Output	4 mV @ 5 CMV (45 degrees)
Frequency Response	10–55,000 Hz
Channel Separation	Average 25 dB, 10–30,000 Hz
Stylus	Diamond Elliptical
Input Load	10k–47k ohms
Induction	50 mH
DC Resistance	660 ohms
Cartridge Weight	6 grams
Tracking Force	1.6–1.9 grams
Compliance	20 um/mN
Mounting	P-mount or 1/2" Screw Mount