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Grado Sonata4 Phono Cartridge
The Grado Sonata4 is the mid-point of Grado's Timbre Series, a moving iron cartridge pairing an elliptical diamond stylus with an aluminum cantilever in a Mediterranean Olive wood housing. It carries the Timbre Series' flux-bridger generator and OCC copper coils, bridging the gap between the entry-level Prestige Series and the boron-cantilevered models that sit above it in the Grado lineup.
Grado Labs has been building phono cartridges and headphones by hand in Brooklyn, New York since 1953. Four generations of the Grado family have refined the company's patented flux-bridger moving iron generator system, which delivers the speed and detail retrieval associated with moving coil designs while maintaining the higher output and simpler loading requirements of moving magnet cartridges. Every Grado cartridge is hand-assembled in the same Sunset Park facility where Joseph Grado first began his work over seven decades ago, then tested and voiced before it ships.
The Sonata4 and Platinum4 use Grado's four-piece OTL (Optimized Tip-to-Link) cantilever, an aluminum design that achieves a 10% tip mass reduction compared to the cantilevers used in the Prestige Series. Lower tip mass means the stylus can respond to groove modulations faster, improving tracking of complex passages and recovering finer detail from the record surface. The aluminum cantilever provides a different balance of properties than the machined boron used in the Reference4 and Master4: slightly warmer tonal character with very good transient response, making the Sonata4 well-suited to extended listening sessions.
The four-piece OTL is also the highest aluminum cantilever in the Timbre line. Stepping above the Sonata4 means moving to machined boron in the Master4 and Reference4, a different material with different tonal trade-offs. Listeners who value the slight warmth and forgiveness aluminum provides on bright recordings often prefer to stay on the Sonata4 rather than chase the additional resolution of the boron-cantilevered models.
New to the /4 generation, the Sonata4 and Platinum4 are housed in Mediterranean Olive wood, replacing the Australian Jarrah used in previous Timbre models. Olive wood's grain structure provides effective natural damping of mechanical vibrations, while its density contributes to stable tracking. The updated housing geometry refines the cartridge profile for easier installation and improved stability during playback.
The shared Olive housing between the Sonata4 and Platinum4 is intentional. Grado uses the same wood and the same cantilever architecture for both, then differentiates the two on component grading. The Sonata4 receives the tighter pairing of the two, with closer matching of the left and right channel coils and a stricter window on stylus profile inspection. From a buying standpoint, the Sonata4 represents the highest performance available within the aluminum-cantilever, Olive-housing platform.
The Sonata4 sits in the middle of Grado's five-model Timbre Series:
New to Grado? The Prestige Series offers the same flux-bridger technology with user-replaceable styli starting at $140.
Every Timbre Series cartridge runs on Grado's flux-bridger moving iron generator, a patented design that sits between conventional moving magnet and moving coil topologies. In a moving iron generator, the coils and magnets stay fixed while a small, low-mass iron armature on the cantilever responds to groove modulations. Because the moving element is just iron, not a magnet or a coil pack, the system carries less moving mass than a standard MM and roughly comparable mass to many MC designs, which is what gives Grado cartridges their characteristic speed and transient detail.
The practical advantage is loading simplicity. Both high-output and low-output Timbre cartridges present an inductive load that any moving magnet phono stage can drive (high-output versions) or that any MC-capable stage can handle (low-output versions). There is no compromise on cartridge loading, no need for step-up transformers on the high-output models, and no exotic phono stage requirement. The flux-bridger architecture also makes Grado cartridges relatively tolerant of capacitance variation in the tonearm cable, which simplifies setup compared to some MM designs that depend on precise capacitive loading to flatten their response.
The Timbre Series uses oxygen-free continuous-cast copper for the generator coil wire, the same OCC copper specification used across the entire /4 generation. Continuous-cast copper is drawn through a heated mold in a single, unbroken process, producing long crystal grains aligned with the wire's length. The result is a wire with fewer grain boundaries per inch than conventional oxygen-free copper, which translates into more consistent electrical behavior across the audio band and improved channel-to-channel matching when paired coils are wound from the same batch.
Coil wire matters more in moving iron designs than it does in many MM cartridges because the generator's output is directly tied to the coil's electrical characteristics. Grado specifies OCC across every Timbre model precisely because consistency at the coil is one of the cleanest ways to lock in repeatable performance unit to unit.
Every Timbre cartridge ships in four configurations: high-output stereo (4.0mV), low-output stereo (1.0mV), high-output mono, and low-output mono. The high-output 4.0mV version pairs with any standard MM phono input, the same input that handles the vast majority of installed phono stages. The 1.0mV low-output version is intended for MC-capable phono stages or step-up transformers; the lower output trades some absolute gain for a potentially quieter noise floor and (depending on the phono stage's MC topology) more headroom on dynamic passages.
The mono configurations are true mono generators with the coils summed at the cartridge, not a stereo cartridge with a mono switch in the preamp. For collectors with significant pre-1958 mono LPs, a true mono cartridge eliminates vertical groove noise that a stereo pickup will reproduce as rumble or surface hash, and it improves apparent resolution on the playback of mono pressings. The mono variants are marked Special Order and No Returns, consistent with how most cartridge manufacturers handle true-mono SKUs.
All five Timbre models share the same tracking-force window of 1.6 to 1.9 grams, with most installations dialing in at 1.75 grams as a starting point. Compliance is specified at 20 µm/mN, which places the Timbre Series squarely in the medium-compliance range that pairs comfortably with most modern tonearms. Effective mass between 9 and 14 grams at the headshell is the sweet spot. Cartridge weight runs 9 grams across the aluminum-cantilever models (Opus4 through Sonata4) and steps up to 10 grams on the Master4 and Reference4, so headshell weight is the main variable to balance during arm matching.
For VTA, start parallel to the record surface and adjust by ear once break-in is past the first 20 to 30 hours. Cartridges in this category typically need that early use time before the suspension settles into its working stiffness.
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| Cartridge Type | Moving Iron (Flux-Bridger) |
| Stylus | Elliptical Diamond |
| Cantilever | Aluminum (4-Piece OTL) |
| Output Voltage | 4.0mV (High Output) / 1.0mV (Low Output) |
| Coil Wire | OCC Copper |
| Body Material | Mediterranean Olive Wood |
| Tracking Force | 1.6 - 1.9 grams |
| Cartridge Weight | 9 grams |
| Compliance | 20 µm/mN |
| Mount | Standard ½" Mount |
| Configurations | High-Output Stereo, High-Output Mono, Low-Output Stereo, Low-Output Mono |
| Origin | Hand-built in Brooklyn, NY, USA |
The Sonata3's main strength is its ability to put the listener in the control room. It just nails the tonality and inner detailing contained within the recording. I got the feeling that the music I was hearing in my living room closely reflected the way the recording engineer had tuned it to sound at the studio. Almost no hum when the cartridge was positioned anywhere over the platter.
,SoundStage Hi-Fi · November 2023
