Grado Timbre Reference4 Phono Cartridge - Mono
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Grado Timbre Reference4 Phono Cartridge - Mono
What You Need to Know
What Is a Phono Cartridge?
A phono cartridge is the component at the end of your tonearm that reads the groove in your vinyl record. A tiny diamond tip — the stylus — traces the groove walls as the record spins, and the cartridge converts that physical movement into an electrical signal that your phono stage amplifies into music. For mono records, the type of cartridge you use matters in a way that goes beyond ordinary performance — a true mono cartridge fundamentally changes what the generator reads, not just how well it reads it.
The Reference4 Mono — Why a True Mono Cartridge Exists
A stereo phono cartridge is designed to read both horizontal and vertical groove modulations. Stereo records encode two channels of audio by combining horizontal modulation (L+R sum) with vertical modulation (L−R difference). This is why a stereo cartridge can reproduce two separate channels from a single groove.
Mono records are different. Pre-stereo records from the 1950s and 1960s, and modern audiophile mono pressings, are cut with horizontal modulation only. There is no vertical signal component carrying music. However, the groove walls of a mono record do carry vertical noise — pressing imperfections, groove debris, and surface artifacts that manifest as vertical movement. A stereo cartridge playing a mono record picks up all of this vertical noise as part of its output, because it is designed to read both planes.
A true mono cartridge solves this at the source. Its generator is built to respond only to horizontal groove movementand produce a single combined channel output. Vertical movement — and all the noise it carries on a mono record — is mechanically ignored by the generator, rather than being summed electronically afterward. The result: quieter backgrounds, greater solidity in the mono image, and a more coherent, focused presentation on mono records than any stereo cartridge in mono mode can achieve.
The Reference4 Mono is Grado’s highest Timbre Series expression of this principle — a true mono generator in the same American Osage wood body, machined boron cantilever, and nude Shibata diamond configuration as the stereo Reference4 variants.
The Nude Shibata Diamond — On a Mono Cartridge
The Shibata stylus profile is conventionally associated with stereo playback of high-frequency encoded content. On a mono cartridge, it still offers meaningful advantages. The Shibata’s finer, more precise groove wall contact means it can trace the horizontal modulations of a mono groove with exceptional accuracy — retrieving more musical information from the walls while reducing distortion from groove profile mismatch. For serious mono record collectors, the Reference4 Mono’s nude Shibata diamond is a level of stylus precision rarely available in dedicated mono cartridges at this price.
The “nude” construction — diamond mounted directly to the boron cantilever without an intermediate shank — eliminates tip mass for faster, more accurate stylus response. Combined with the stiffness of the boron cantilever, this gives the Reference4 Mono an unusually precise and low-distortion mechanical signal path for a dedicated mono cartridge.
American Osage Wood Body
The body is machined from American Osage wood — one of the densest native North American hardwoods, shared with the Master4 and the stereo Reference4 variants. Osage’s density provides natural acoustic damping for the generator assembly.
6N OCC Copper with Cryogenic Treatment and Internal Damping
The Reference4 Mono’s internal signal path uses 6N OCC copper — 99.9999% purity. Cryogenic treatment of the stylus assembly and signal path improves conductivity and mechanical stability. Internal damping within the cartridge body reduces residual resonance. The same trio of refinements that distinguish the Reference4 from the Master4 in the stereo versions applies to the Mono as well.
Who the Mono Version Is For
The Reference4 Mono is designed for listeners with a substantial mono record collection — whether vintage pre-stereo originals (1950s and early 1960s), 78 rpm shellac with appropriate stylus, or modern audiophile mono vinyl reissues. If mono records are a regular part of your listening, a dedicated mono cartridge produces results that a stereo cartridge in mono mode fundamentally cannot replicate.
The Reference4 Mono should be used exclusively on mono records. It will not correctly reproduce stereo records, as it reads only horizontal groove movement and outputs a single combined signal.
Phono Stage and Setup Notes for Mono
The Reference4 Mono produces a single-channel output that will appear on both channels of your phono stage, or can be summed to mono. Most modern phono stages output both channels and can be summed to mono in the preamplifier or integrated amplifier. Verify your system’s mono capability before purchasing. The electrical loading recommendation is 10k–47kΩ — standard MM loading. Specific output voltage, inductance, and DC resistance for the Mono version should be confirmed with Grado before publishing.
What the Experts Say
ecoustics confirmed the Reference4 as the top of the Timbre Series and noted it is offered in high output, low output, and mono configurations, all sharing the same American Osage wood body, machined boron cantilever, nude Shibata diamond, and 6N OCC copper with cryogenic treatment and internal damping. They described the mono offering as part of Grado’s commitment to serious mono playback across the Timbre lineup.
Grado describes their mono cartridge approach as a “true mono generator” that “reads horizontal groove movement only,” eliminating vertical groove noise at the generator level rather than through electronic summing. The Reference4 Mono applies this philosophy at the top of the Timbre Series, where the nude Shibata diamond and 6N OCC copper give mono record collectors the most resolved playback available within the Timbre range.
Pairing the Reference4 Mono
- Phono Preamplifier with Mono Capability. The Reference4 Mono produces a single-channel signal. Confirm your phono stage can accept and output a mono signal, or that your preamplifier can sum to mono. Most modern systems handle this straightforwardly. Call us if you want help confirming compatibility. Browse our Phono Preamplifiers.
- Dedicated Mono Turntable or Tonearm. Serious mono collectors often maintain a dedicated turntable or second tonearm for mono playback, avoiding the need to swap cartridges. The Reference4 Mono is the right cartridge for such a setup at the top of the Timbre range.
- Record Cleaning. Vintage mono records benefit greatly from thorough cleaning before playback with a precision stylus. Browse Record Cleaning Machines.
- Turntable. 9.6g cartridge weight (assumed — verify), 20 μm/mN compliance (assumed — verify for mono version). Medium-mass tonearms are a good match. Confirm with Grado.
Features & Specifications
True Mono Generator — Horizontal Groove Movement Only
The Reference4 Mono reads only the horizontal groove modulations of a mono record. Vertical movement — and the groove noise associated with it on mono pressings — is mechanically ignored at the generator level, not summed or filtered electronically. The result is quieter backgrounds and a more coherent mono image than any stereo cartridge in mono mode can achieve.
Nude Shibata Diamond
Finer, more precise horizontal groove tracing than an elliptical stylus. Nude construction minimizes tip mass. Extended frequency response specification. The most advanced stylus profile available in a dedicated Grado mono cartridge.
Machined Boron Cantilever
Highest stiffness-to-mass ratio in the Timbre Series. Precision-machined for consistent geometry.
American Osage Wood Body
Dense North American hardwood. Natural acoustic damping for the generator assembly.
6N OCC Copper, Cryogenic Treatment, Internal Damping
6N (99.9999%) OCC copper. Cryogenic treatment for improved conductivity and stability. Internal body damping for lower noise floor.
Specifications — Mono
- Generator type: True mono — horizontal groove movement only
- Stylus: Nude Shibata diamond
- Cantilever: Machined boron
- Body: American Osage wood
- Internal signal path: 6N OCC copper, cryogenic treatment, internal damping
- Input load: 10k–47kΩ (verify for mono version)
- Recommended tracking force: 1.6–1.9g (verify for mono version)
- Compliance: 20 μm/mN (assumed — verify for mono version)
- Cartridge weight: 9.6g (assumed — verify for mono version)
- Output voltage, inductance, DC resistance: Verify with Grado before publishing
- Made in USA (Brooklyn, NY)
- MSRP: $1,500 (verify — mono pricing may differ)
Frequently Asked Questions
Why use a true mono cartridge instead of a stereo cartridge in mono mode?
A stereo cartridge in mono mode sums the two channel outputs electronically — but it still reads both horizontal and vertical groove modulations before doing so. The vertical component on a mono record carries noise, not music: pressing imperfections, surface debris, and groove damage manifest as vertical movement. A true mono cartridge ignores vertical movement at the generator level, so that noise never enters the signal. The result is quieter backgrounds, greater image solidity, and a more coherent mono presentation than electronic summing can achieve.
Can I play stereo records with the Reference4 Mono?
No. The Reference4 Mono reads only horizontal groove movement. A stereo record encodes the difference between the two channels in vertical groove modulation. A mono cartridge will not reproduce that vertical information, so stereo content will be missing the L−R component. The Reference4 Mono should only be used on mono records.
What records is this designed for?
Pre-stereo mono records (typically pressed before 1958–1960), 78 rpm shellac with an appropriate stylus, and modern audiophile mono vinyl reissues. If you have a meaningful collection of any of these, a dedicated mono cartridge like the Reference4 Mono will produce substantially better results than a stereo cartridge in mono mode.
What phono stage do I need?
Any phono stage with an MM-compatible input at 47kΩ should work (verify mono-specific electrical specs with Grado before confirming). You will also need a way to output or sum to mono — either a mono switch in your preamplifier, a phono stage with mono output capability, or a separate mono switch box. Call us if you want help planning your mono playback chain.
Where is it made?
By hand, in Brooklyn, New York. Grado Labs has assembled phono cartridges there since 1953.
What’s in the Box
- Grado Timbre Reference4 Mono phono cartridge ×1
- Stylus guard
- Mounting hardware (screws and nuts)
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Building a dedicated mono playback system or curious about what a true mono cartridge can do for your vintage records? Visit our Audio Advisor Learning Center.
- True mono generator — reads horizontal groove movement only. Vertical noise on mono records is mechanically ignored at the generator, not filtered electronically. Quieter backgrounds and more coherent mono imaging than any stereo cartridge in mono mode.
- Nude Shibata diamond stylus — finer, more precise horizontal groove tracing. Nude construction for minimum tip mass. Most advanced stylus in a dedicated Grado Timbre mono cartridge.
- Machined boron cantilever — highest stiffness-to-mass ratio in the Timbre Series.
- American Osage wood body — dense hardwood for natural acoustic damping.
- 6N OCC copper internal signal path — 99.9999% purity, highest in the Timbre Series.
- Cryogenic treatment — improved conductivity and mechanical stability.
- Internal body damping — lower noise floor.
- For use on mono records only — pre-stereo originals and modern audiophile mono pressings. Not suitable for stereo records.
- Hand-built in Brooklyn, New York, USA since 1953.
- Generator: True mono — horizontal groove movement only
- Stylus: Nude Shibata diamond
- Cantilever: Machined boron
- Body: American Osage wood
- Internal signal path: 6N OCC copper, cryogenic treatment, internal damping
- Input load: 10k–47kΩ (verify for mono version)
- Tracking force: 1.6–1.9g (verify for mono version)
- Compliance: Verify with Grado before publishing
- Cartridge weight: Verify with Grado before publishing
- Output voltage, inductance, DC resistance: Verify with Grado before publishing
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